It is interesting when you read the "scholarship" of most present-day Mormon apologists, they often will claim to have a "spiritual" confirmation of the subject matter, but never actually say what that basis was.
I personally did believe in a few coincidental experiences which I as a believer thought were miraculous (such as praying to stop rain). But once I put the experiences into the broader context, I saw that it was not rational for me to believe I had witnessed a miracle. Nonetheless, these sorts of things were the real anchor for my Mormon beliefs. Whatever verbiage I could use to "prove" Mormonism was true, but only because it confirmed my own feelings. The experiences and the feelings were more true than my intellectual justifications, in other words.
I suspect this is a pretty common thing, but I wonder if perhaps I could be wrong.
ETA: I think that because fundamentalists have a feelings-based epistemology, this may explain why they are so prone to adopt and discard arguments rapidly. Ultimately, the things you say to protect faith don't matter. What matters is the feeling.
And we did such things because we were instructed to, as in the famous Moroni 10 promise:
Educated adults know that this is not how you gain knowledge outside of the context of faith. But within faith, we're taught to discard what our own experience teaches.And when ye shall receive these things, I would exhort you that ye would ask God, the Eternal Father, in the name of Christ, if these things are not true; and if ye shall ask with a sincere heart, with real intent, having faith in Christ, he will manifest the truth of it unto you, by the power of the Holy Ghost.
And by the power of the Holy Ghost ye may know the truth of all things.