PETA's stupid because everything we do will kill animals at least indirectly. We log forests and destroy habitats, we pollute, we build dams and kill fish, we eat plants that are now going to feed us instead of mice and insects... the entire industry of agriculture contributes to the lessening of habitats and pressuring the populations. Stopping wearing fur coats or going vegan really doesn't do much, and I doubt we'll see a "FREE TEH SPOTTED COW" revolution any time soon.
PETA wants to put an end to interdependence which really can only come when you die, and even then you have things eating your corpse.
I would respect PETA's cause if they weren't friggin nutjobs and started on a scale that actually got something done, like lobbied for tightening environmental protections or getting more national parks. Starting there and working up, not going "your mommy kills little bunnies!" which doesn't do crap, really.