Peter Singer is a moral idiot, and a deranged person - supporting, not merely abortion, which is bad enough, but infanticide, forced euthanasia (for the demented), beastality, necrophilia, etc. His views an animal treatment are also too extreme, and devaluing to humans. Such intellectual crimes can be multiplied endlessly.

But we can stop him by turning his insanity against him!

As a preference utilitarian, he believes that we should maximize the satisfaction of the most preferences. So if we get enough people to prefer that he be locked up, we can force him to admit that he should be locked up in an insane asylum - or better yet, an island in the middle of nowhere - so spread the word!