It seems to me at times that these types are those unable to form stable relationships with those of the opposite sex. It's almost like, "I hate men, and have a personal vendetta that I want to take to a global scale. I'm not going to have children with any man ever, so I want all women to join me in my misery; you must go as far as to kill any offspring you produce with them."
Sick.
I think you're right. A great portion of the pro-abortion movement is made up of people that demand that the world join them in their misery. Subconsciously they are filled with rage that anyone should be happy if they are not.