But Singer is as controversial as he is influential. Not so much for his attempts to disrupt complacent common-sense ethical beliefs — that, for example, we’re justified in prioritizing the welfare of those close to us over that of strangers far away — but more for his arguments in support of things like allowing parents to pursue euthanasia for severely disabled infants. It’s those ideas that have led Singer to being called dangerous, a eugenicist and worse. None of which seems to matter much to Singer, who, as always, is determined to follow his ethical ideas wherever they may lead.