How exactly does having visions reflect on credibility in telling the truth? We are not talking about their testimony about visions and miracles, but their personal observations under ordinary conditions. Otherwise normal people have visions, speak in tongues, etc. You can’t be suggesting they hallucinated Joseph Smith dictating the Book of Mormon with head in hat, so you must be accusing them of lying. Having visions doesn’t make one a liar.
Maybe not but it is definitely grounds for increased skepticism. There are several problems here. First, in this case you're attempting to label Joseph Smith sticking his head in a hat while allegedly gazing into a stone (for Pete's sake!) and reading off words that magically appear and are said to be a divine translation of an otherwise unknown language "ordinary conditions." (!) I suspect your familiarity with early Mormonism leads you to that (probably subconscious) conclusion. There's nothing ordinary about that claim, even given the increased acceptance of a magical worldview in Joseph Smith's day. If it was ordinary, it wouldn't have been particularly noteworthy. So the claim itself is rather extraordinary and should raise legitimate questions about what is really going on.
Second, you acknowledge that these particular witnesses all had a propensity to see visions, speak in tongues, etc. I grew up in a Pentecostal church where such activity was considered "normal." But as I look back I have come to realize it was only normal among the circle of believers. Even other Christians who were not Pentecostal thought speaking in tongues was a bit odd--if not from the devil. For several reasons, I have become very skeptical of anyone who claims to speak in tongues. The question, for me, is, can anyone who claims to be speaking in tongues actually be telling the truth? I don't think so, and like I said, I grew up with it being "normal." I mentioned earlier that I was hired about a year ago to videotape a faith healer. It was quite obvious to me (especially having the ability to watch the video in slow motion) that this man is a fraud. And yet it sure seems as though his devoted followers truly think he's everything he claims to be. They fall over when he nudges them on the forehead. They begin speaking in tongues when he lays hands on them. Some even jump around claiming to have been healed of whatever ailment they had. But I'm 99.99% sure he's a fraud. I don't know whether he believes his own propaganda but I suspect not.
I will give one brief example to illustrate what I'm talking about. This is just one of his many stories. He claimed he was coming to Phoenix the previous year for a healing crusade and contacted a local pastor to encourage this pastor to bring his congregation and help spread the word, but the local pastor had a lack of faith and wanted a sign that this guy was really a "man of God." Okay, he agreed, here's your sign... when I come to Phoenix it will start raining and it won't stop until I leave. Of course, according to our faith-fraud, it started raining the minute he stepped off the plane and stopped when he left. This story would have worked, except that he made the mistake of being too specific with dates and he actually mentioned the month that this crusade took place.
Well it doesn't rain very often in Phoenix so I checked and sure enough, the entire month, that year, there was no rain in Phoenix.
Another one of his claims is that he was on the phone with a woman who's daughter had just died and while they were talking she came back to life. This is the kind of stuff we're dealing with.
So is this guy a liar? Does he believe his own propaganda? And when his followers jump around and claim to be experiencing miraculous events after coming into contact with this guy, are they lying?
Who knows how we should categorize such claims? But it's easy to note how people like this become fanatical about their charismatic leader and his claims and are willing to defend him or her even in the face of contrary evidence. One woman must have noticed my skeptical looks as she tried to convince me it was the real deal.
Many will eventually become disillusioned with that particular individual but usually not the concept of miraculous intervention in general--I've seen this happen. They may simply transfer their faith on to a new charismatic leader until they again become disillusioned.
This explains why early Mormons could leave the church or become disillusioned with Smith, while still believing in the Book of Mormon and the miraculous claims of how it came to be. But it could also be that some of them knew more than they were telling and yet still believed in the larger cause.
My faith-healer fraud friend had an accomplice. I noticed as he came out at the beginning of one of the services I taped, he had another guy come out with him who was carrying his Bible and sat with him on stage. Something like a faith-healer apprentice. It was interesting to note that after we had gone through well over an hour of miraculous story-telling, and we had gotten to the part where the congregation is supposed to come forward for healing, tongues and whatever, this apprentice was eventually prayed over, and wow, what a show he put on, not just falling slain in the spirit but simultaneously shaking, falling to the floor, kicking, moving arms and shouting. It was quite impressive. Obviously, this is how it's supposed to look. So is he a liar? Or just a highly devoted apprentice? How do you draw the line? If I had asked the guy I have no doubt he would have told me, yes of course I was slain in the spirit and you can be too.
Either way, the propensity to see visions, speak in tongues and work miracles is a red flag that should lead rational people to a higher degree of skepticism with regard to these kind of testimonies. And that's not just picking on early Mormons, Dan, that goes for any group making similar extraordinary claims. Personally, I don't rule such claims out on their face, but I do take them with a higher degree of skepticism. And again, I don't think it's valid to say the head in hat element of their testimonies is ordinary. Joseph may have put his head in his hat, but you and I agree it was done as part of an act. Every time he put his head in the hat, he was doing it to deceive.
And yes, he was obviously pretty good at fooling at least some people, but, again, the propensity to believe in miracles, tongues and visions points to someone who is naturally more open to being deceived or even more willing to play along--whether they stop to question their own doubts or not. When you add the element of faith-driven peer pressure, you have a recipe for devoted followers who just might be willing to lie (and could probably rationalize it as not lying) in order to preserve the larger cause, or to avoid being viewed as someone having a lack of faith.
This is the typical Book of Mormon witness. So was Whitmer, for example, lying when he claimed no Spalding ms was used? Maybe so. Given his devotion to Smith (at least in the early days) and the larger cause of restoration, I certainly wouldn't rule it out. On the other hand, there is nothing demanding that he would have been in a position to know anyway. Either way, I don't trust his word when it comes to that claim just like I don't trust his word when he claims words miraculously appeared in the stone.