I don't think its fair to characterise Sanger's views as simply hatred.
She only acknowledged, and supported the theory that "unfit" women are more likely to have an abortion (this coincided with the black population).
For example:
Sanger saw birth control as a means to prevent "dysgenic" children from being born into a disadvantaged life, and dismissed "positive eugenics" (which promoted greater fertility for the "fitter" upper classes) as impractical. Though many leaders in the eugenics movement were calling for active euthanasia of the "unfit," Sanger spoke out against such methods. She believed that women with the power and knowledge of birth control were in the best position to produce "fit" children. She rejected any type of eugenics that would take control out of the hands of those actually giving birth
This does not seem like a woman who had a vitriolic hatred of black people and wished to see them all dead.
In 1926, Sanger even gave a lecture on birth control to the women's auxiliary of the Ku Klux Klan in Silver Lake, New Jersey.[11] She described it as "one of the weirdest experiences I had in lecturing," and added that she had to use only "the most elementary terms, as though I were trying to make children understand."
This was not some racial warrior trying to kill all "undesirables". She merely saw a correlation between race and condition, condition and reproduction and genetics and condition; and defended the outcomes.
Does the fact that 70% of abortions take place in minority areas make it any worse than if they had taken place in white areas? Why should it matter that more black babies are aborted than white babies? Surely in your eyes, a crime is a crime, isn't it?
even when the child is born, it has no free will, or should I say volition? and guess what, after birth, rights come into effect! It is
not inside her but the child will die if the mother doesn't choose to help, or anyone else (doctors) for that matter. 
The children are not 'potential' sentient lives. 
