After Ashoka had his revelation he converted to Buddhism.
As for reincarnation, that would have to start by determining whether or not there is such a thing as a soul, which I consider inconclusive at best. Also it's not a matter of belief, from a scientific point of view, it's a matter of whether or not there's evidence to determine whether or not it's real.
If it is a matter of belief, and someone can control beliefs of others they can partially control decisions based on those beliefs, accurate or not, which is a fundamental of cult indoctrination.