Erhm, the Wild Hunt comes to mind......and if you've ever seen humans as a gang pack hunting, yeah that's brutal.
Nothing wrong with the Herlaþing - much more sensible anthropomorphic deity than many - and at least realtively local - can't stand those cheap imported ones.
I suspect that half those old tales are firmly rooted in humanity's supposed 'idyllic' natural past, and it's not that peaceful.
Just like the present then really. Human beings are just animals after all - nothing will change those animal insticts and pack mentality - much as we like to pretend otherwise