Just this week in the news about the gang rape at Cornell university in the USA.
A female student was raped by many male students. Whilst she was being gang raped, and it was being videoed, one of the rapists sent a text to every male student in his 'frat' house (an all males hall of residence in UK language), that he and his mates were currently gang raping a girl and did any of them want to join in. He sent that on the house Whatsapp group.
57 boys / men were on that group. Not one of them stopped it.
Not all men. Do me a favour.