Margaret Sanger's defenders all have one thing in common - they weren't aborted.
I can't say if they all believe in fantastical moral equivalences too, but one who read Jonah Goldberg's writing clearly does. He reproduces her screed here. She manages to find similarities between Margaret Sanger and Helen Keller and various other historical figures. Thus in her world Justice! demands that if anyone condemns Margaret Sanger as Goldberg has for her views, he must do the same of Helen Keller and the others.
Helen Keller might not be well remembered today, but she was famous for overcoming both deafness and blindness to become a prominent American. She was in fact very liberal, as anyone else might be if they were as limited in their ability to experience the real world as she.
What's interesting is that Mr. Goldberg was demonstrating the historical ties between liberals and eugenicists. Mr. Goldberg's critic apparently did not say where Ms. Keller stood on eugenics. What do you suppose eugenicists would have done with a girl who was both blind and deaf?