The only thing necessary for the triumph of evil is that good men do nothing.

“Now, we must all fear evil men. But there is another kind of evil which we must fear most, and that is the indifference of good men.”

More excusable when it’s not explicitly their job to do something.

Or measure ‘good’ as a relative definition. While they will personally not do the agreed definition of a bad thing as they watch on as the bad thing happens but stand beside it and say “see? I’m not as bad as them.”