Leftists claim that unborn children can be killed because they aren't really human. That's what the slave-owners said, too.

Discrimination of a large group of people over something they can't help? Check! Discrediting their humanity because something about them is different than you? Check! Justifying acts of violence against them because you PERSONALLY don't think who or what they are deserves their God-given right to live? Double check! Abortion is prejudice!