Same dude that thinks that babies that are a few weeks out of the womb are fair game.
Peter Singer is a so-called moral philosopher who is world renowned. He is an evil man. I had an ethics class that studied one of his books. As I recall, he postulated that children up to the age of self awareness (2-3-4) have no more rights or value than many animals. Furthermore, he advocated that parents should have the right to terminate (kill) their children up to the age of self-awareness because in his view, they are no more valuable than many animals.
Yes, the liberal, amoral, agnostic mind loves to push the envelope to ever greater vain and evil imaginations. With many parallels to Singer's moral code, Hitler justified killing useless eaters and those he considered "impure" and "sub-human".
Ain't godlessness fun!! (sarc)