But, if we kill them all off, then they aren't around to evolve. However, perhaps if a few of the stronger ones survive, maybe the same as viruses behave, they will reproduce with the stronger tendencies and be harder to kill. Though viruses reproduce so quickly which makes that viable.

Strangely I was thinking of this yesterday (good old synchronicity), how no earthly animals have come close to successfully dominating humans (to my knowledge). I even thought...would it be possible if gorillas picked up guns and learned to shoot them that they would then have some sort of equal defense? But then, they wouldn't be able to build their own guns or produce ammo. So, yeah, it seems kinda futile for the animals, as far as I can tell, unless humans show compassion and management. Or unless aliens sort us out.