If you want me to assume responsibility for something, show me how I'm in charge of it.
If I encountered a situation where a man was threatening a woman on the street I'd reach down and defend her with every weapon on my hip.
With no power comes no responsibility.
And many people apparently don't understand what has led to the problem. The well-intentioned but poorly executed push for equality, has indeed led to a more equal outcome for men and women to the point women have to defend themselves, in the same way men have had to. We have degraded the social structure of complementary skills and roles, creating a slop of homogeinity, making us less capable, less caring, but more independent.
I think the expectation is that men should intervene regardless of their ability to do so. The assumption is that all men are equal in size, strength, skill and therefore should take matters into their own hands. I hear that carrying machetes is the new manly thing to do.