They know! I’m willing to bet that more of them notice than don’t notice, but since it doesn’t directly affect them, (and in some cases the violence of other men benefits them), they’ll do and say nothing to stop it, while crying that they always protect women. (In the meantime, their idea of protection entirely consists of committing acts of violence against other men, after the fact!)

There are men who benefit from the violence of other men because they know that violence will drive women into the arms of men like themselves who meet the very low bar of not engaging in violence.