Think where the rubber meets the road is humans can’t really know who will be judged and who will be saved. So while one can believe one is doing righteous things, and others are sinning, it’s really up to God and therefore dangerous to believe one is righteous or knows best for others.

I mean there are obvious cases (like child predators) you can be pretty sure will meet an unpleasant fate, one way or the other, but mostly we just don’t know, even with respect to ourselves.