What????????? He had already killed and wounded other innocent people and was firing on police from the cabin. How many more innocent people did you want to see die?
The law only allows deadly force if a person’s life is in *immanent* danger. The cops were not in immanent danger. Regardless of what you believe to be the case, killing a suspect under these circumstances was illegal. It doesn’t matter what you think of the guy or what you believe to be his crimes, the job of the police is to bring a suspect in for trial not to exact revenge for their fallen comrades.