There is so many things to comment here on. There are important social problem with gender roles, but we should also recognize what the problems area are and where they aren't.
Women are not a permanent lower caste. In term of their social status (and social economic status) their median are similar, even slightly higher than men. Their variance is much smaller, with few women at the very high and and very few at the very bottom. This difference in variance do causes problem for society but the fixes are less obvious than in cast societies where one demographic fully dominate the bottom of society. When looking at household social status, women have much higher in average social status than men (for the above reasons).
Women are also not victims of violence more men. The opposite is true. Men are much more likely victim of violence then women. Women are much less likely however to be perpetrators of violence towards men. In term of behavior there is also the slightly less known fact that in domestic context, violence from a man to a woman, man towards an other man, and woman towards an other woman is identical in violent domestic disputes per household. This is why the full title of those reports tend to be called "men's violence again women and violence in same sex relationships". The implication in terms of genetics is that either a person sexual preference influence violence, or women and men are equally violent but in different contexts.
(Edit: To pull down some statistics from Sweden as an example. Men are the most common recipient to need social support. Single men without children living below poverty line are more than twice the size of the next group below, which is single women without children living below poverty line. The group after that is single mothers, and the one after that are families with two married adults and at least one child.)