PETA's cause, from what it seems, is the same as any other collectivist ideals: that humans, having the ability of reason, ideals, and concepts of times and whatnot, are "animals, too", and have to apologize for being rational human beings - by putting ourselves on the same level of cows, dogs, pigs, and goats. In name, they seem to support the ethical treatment of animals - and really, who is pro-inhumane treatment? However, in practice, they are for the destruction of freedom on the basis of the ridiculous practice of "animal rights". That implies that animals have inalienable rights that we cannot infringe, which include life, liberty, and the pursuit of happiness.

The right to life - we should sooner starve than kill a cow. Liberty - we should let the animals roam the streets, to be at their mercy, rather than domesticate them or otherwise protect ourselves from them. The pursuit of happiness - becuase although animals are unable to experience complex emotions such as what real happiness is, we must respect their right to do so, much in the same way I have the right to breathe underwater - if I ever gain the capacity to do so - and must be treated as if I can.

Sorry if I sound dogmatic, but this is bordering ridiculous.