” I have known quite a few individuals who had they been Jewish would be considered apikorsim and totally off but they managed to fool batei din in to converting them.”
Yeah, this unfortunately smells of one of those cases. I think the batei din are actually probably good in general about keeping those kind of people out, but there are so many weird people in the world that a few a bound to slip through. I know someone who is a vocal meshichist who got through the Queens beis din. I’m not insulting that beis din at all; it’s just a tough situation.