STILL CAVEMEN AFTER ALL THESE YEARS?

I just watched a thoughtful TED Talk given by President Jimmy Carter this past May, reflecting his feelings that the abuse of women's rights is the number one human rights problem in the world.

I can't help but wonder how is it that women in general have never lived with full social equality even though there are roughly the same amount of women and men born on the planet?

My own thoughts on this:
A.    It's not about the brains.
B.    The larger physical build of men. This obviously does make a difference in the power balance.
C.    Many societies and cultures have trouble seeing women as little more than sexual objects/targets.
D.    The fact that women bear the task of growing the next generation within their wombs, placing women in a vulnerable physical state during pregnancy. 
E.    Women typically spend more time in child rearing than men, which often lowers a woman's financial earning capability.

These biological  and societal facts cause so much societal grief. 

Grief if a daring career woman chooses to delay pregnancies or to bear no offspring at all. 

Grief if a woman chooses to spend more time at that job than in personally nurturing her child. 

Grief if a man chooses not to help support the woman he has impregnated and the child she has borne. 

Grief especially, if men do not respect the miraculous process of pregnancy and birth which women are vessels to and which women seek to have control of.

I don't know if this lack of respect for women's contributions to life on this planet is a type of unconscious jealousy by men of women's ability to grow new life. Or is it some caveman instinct to try and to control one's bloodline? 

At this point in time in human history I would have hoped for more than that!