If they thought God told them to, maybe, I dunno. But they're not that delusional, so it's kind of a tricky question!

But they're not crazy. The people you listed most likely had serious mental problems, and the mix of such problems and the p/c mindset that God gives individuals specific instructions is a disaster.

I don't know if p/c causes mental illness (I suspect that it can and does!), or if it merely attracts those who are prone (and exacerbates the illness). Either way, p/c is not a good place to be, if you have mental health problems!
Tim