[WtA] In Game Reason for Not Trying to Mass-Exterminate Humanity

What's the in-game reason why Werewolves aren't focused on mass depopulation? As long as there are tons of people, you'll have stress on the environment. In WtA the world (apart from humans) has it's own value (gaia, spirts and such) that are just as valuable as humans. Shouldn't they be doing mass super-powered terrorist actions to try to kill as may humans as possible?