Because they worship a religion called Cultural Marxism, incredible double standards which would cause most sane people's brains to melt from cognitive dissonance are rampant among contemporary Leftists.

They frequently call people with whom they disagree "white nationalists", signaling an apparent objection to the concept of "ethnostates". Yet before week one NFL games, they are going to play something called the "Black Anthem".

Leftists put up yard signs saying "Black Lives Matter" when a black person dies, yet when a guy flies a plane with a "White Lives Matter" banner after white people are executed in a terrorist attack, he gets harassed and fired-- to go along with the obligatory pearl clutching, naturally.

They veritably worship Rainbow People and feminism, yet simultaneously and universally side with Muslims; in many Muslim countries, sexual deviancy is a crime punishable by death, and women are forced to wear full garb, enforceable by beatings, by men.

Finally, and to this writer's knowledge, not one white person rioted, looted, or started a building on fire when this white fellow was killed by law enforcement. There are also no "White Lives Matter" law signs, no Right-wing "CHAZ", and no kneeling before national anthems. There are no CEO statements on the Twatter, and no employees being told they are racists with "unconscious bias" against whites.

Not that any of that should happen-- obviously! The point is, rather, that civilized people act civil.