There are few things I’m afraid of more than a man that thinks himself righteous, because there is very little that such a man would be unwilling to do.
So it makes sense to be cautious when I find myself feeling like one, or being pulled along by the emotions of another who does.
You're not wrong about the danger posed, but take a step back and consider who this attitude helps. The greatest beneficiaries of a culture in which good faith and civility are unconditionally granted for fear of misguided righteous anger is a paradise for fraudsters and bad faith actors. I think we're seeing that world now.