Same reason why I'm anti racism, anti colonialism, pro animals rights, pro inclusion, pro safety of those who are weaker, even if those things don't impact me. To simplify this whole thing you should just ask yourself 1. Do you feel like women owe you something? 2. Do you think your beliefs or Gender roles and all that nonsense should be forced upon everyone? 3. Aren't you genuinely disgusted of the history and the current stats of how women have been and are being treated at the hands of men? Simple as that for me.