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If you feel the need to hit a woman, you are pretty much a worthless pile. You should be able to walk away. Even if she hits you first.
The ethical dilemma comes up when the woman does something to even the physical advantage held by men. What if she is threatening with a weapon, what if she knows fighting techniques, what if she won't let the man walk away, etc?
Those women are taking advantage of a rigged social dynamic. Men cannot defend themselves in this situation without being seen as the aggressor. And they stand to lose everything: children, house, status, job, etc.
So defend yourself or hope she doesn't kill you with that bat? Dunno. It's a catch-22.