In real life, poachers are totally evil. But in Far Cry 3, they're just trying to survive. Over the first ten hours or so of Far Cry 3, we probably spent more time just hunting animals than doing actual missions. It's that much fun. We don't know why, but it is.
But as far as animal rights activists are concerned, hunting is bad enough as it is. Hunting without a permit, on a foreign island with no idea what kind of impact you'll have on local ecosystems? That's downright irresponsible.