"He appears to condone infanticide, which certainly puts him out on the lunatic fringe."
Ahem - Professor Peter Singer is famous and influential and teachers many students in Princeton and is honored by acamedicians and thinkers all over the world. Hardly lunatic fringe.
He also considers euthanasia a good thing, as well as sex with animals. And a whole bunch of others stuff that old fogey traditionalists like me and others on this thread consider gravely immoral.
But once everyone gets to determine what's right and what's wrong for themselves, who care? It's all relative. So what if you think (just for an example) sex with animals is disgusting and wrong? Some people like it and so it's okay for them. So what if you think killing useless old people is cruel and wrong? Plenty of people think it'll improve society, so your opinion is worthless.
Famous at Princeton is almost the exact definition of lunatic fringe.
jas3