They are doing this become Alky dictated it, but for many of them. I suspect they are doing it in a "The ends justify the means". If I were over 300 years old and lived long enough to see war over and over again, I'd be desensitized. Heck, we've mostly agreed that Chronos has done a lot of good since taking over the world, I'm sure some Zoalords view it as such.