I find it weird that everyone jumps at Nazis when they do something bad, but when it's police being killed at BLM protests or people getting hit in the head wit

I find it weird that everyone jumps at Nazis when they do something bad, but when it's police being killed at BLM protests or people getting hit in the head with bike locks and shot at at Antifa protests, no one bats an eye. Why is it okay to leave out Black Nationalists and Communists/Anarchists and solely focus on Nazis? All these groups have blood on their hands.