So sex differences only exist when they benefit men?
So you like a little projection with you non sequiturs?
That mothers would be more invested in their offspring is easily predicted by that fact that they have a massive biological investments in their offspring that men lack
They have the same long term investment: passing on genes. Biology 101.
it's one of those things that I'll simply cite as obvious.
What's obvious is you haven't seen the statistics showing that if you have to chose one parent, children are better off with their fathers than their mothers. Drug use, teen pregnancy, graduating from high school, incarceration rates...it's not even close. Before you whine about the web site name, note the copious amounts of sources, and your inability to counter them.
Unless you bring a weapon into the equation strength becomes relevant because it creates a power imbalance.
Some part of "abuse is about abuse, not who is stronger" that you have a hard time understanding?