Sometimes wanton destruction and violence are just the thing for stress relief - and monsters, you don't have to worry about moral quandaries with monsters. So far nothing the so-called Gods have brought along with the people have been sentient, and even if these things are (they are, sadly) whatever monstrous hunger that compels them has overridden that.

Rainier was made for stamina, between the two of them they'll be able to see the end of this. Even if there will be a bad need for a clean-up after.