This childish "us vs them" attitude is not healthy. You know, sometimes in life, when dealing with certain forces of chaos and disruption, which can be safely

This childish "us vs them" attitude is not healthy. You know, sometimes in life, when dealing with certain forces of chaos and disruption, which can be safely categorized as entirely malignant, e.g. the Mafia, the Khmer Rouge, ISIS... or a certain mentally imbalanced fascist demagogue currently masquerading a the leader of the free world -- you just need take a clear stand, and call a spade a spade. Which you can call an "Us v. Them" attitude, if you like. But calling people who recognize this fact "childish" isn't helpful at all.