I don't think it's bias when I'm aware of actual incidents. Obviously I could be wrong and these incidents aren't long run indicators, and obviously some proportion will likely eventually end up okay because nothing is set in stone.
But when kids are doing things that would get adults jailed I don't think it's bias, though. It's more like a depressing probability.
Many bullies go on to become leaders and get high positions, and it isn't rare for sex scandals with leaders etc. So no such things aren't really god indicators for how they do in a job market.
Of course you don't want people to do that anyway, but being nice and being competent are two completely separate things.
That is your bias against these boys, that isn't reality.