I think there's a Goldilocks zone of moral flexibility and openness somewhere in between complete moral rigidness and total amorality, I think.

The zone of moral rigidness contains all those species of fundamentalism that have caused so much conflict and atrocity. It's one one of the very bad zones.

But another very bad zone is the total amorality of psychopaths and narcissists (and they often pretend to be in the other zones), and they are also responsible for so much destruction an atrocity.