Because humans fucked nature that's why. They disrupted the natural habitats, changed the land to fit it's need. That's what we humans do. That and introduce creatures in areas that shouldn't be there in the first place.
...And?
You fuck nature just by your mere existence as a human. Every day in, every day out. If you want to pedantic about, there is nothing about a human that doesn't impact nature in some way, negatively according to some animal or habitat, in some way.
The question is just to what degree.
And it's not like it stops feral hogs from being 1.) Animals or 2.) Wild animals doing damage to other animals and humans.