Cats: good or bad

I think that it depends on the locality. In localities where the cats were present outside for “ages” (like in the Central Europe where I live), other species had a long time to be used to that and beware of the cats as their natural predators. (And they are not just feral, they are normally kept by somebody but allowed to go outside as well.) The other situation is in the places, where there were no such predators before cats were introducted.