I would rather get blown up by terrorists than get cancer.
It is more ethical in any altercation between a cop and a non-cop for the cop to die than the other party, as the cop consented to a job with that risk and the other person did not.
I am allowed to be here.
The Supreme Court of the United States has ruled that the remedy to bad speech is not censorship but more speech, and therefore it is incumbent upon any citizen when they see bad or dangerous speech to speak louder than the bad speech, not quietly in the corner.
Sometimes a riot is the right answer.