Sure, the wolves were hunting too, but the problem here is this type of wolf doesn't belong in this ecosystem- the wolf that was native to Idaho didn't behave this way. These Canadian Gray Wolves were INtroduced, not RE introduced. This is the problem: the animal is being exploited by the fools who brought them here!
One could argue that Europeans were INtroduced to America.
Besides that, to my knowledge, animals aren't bound by geo-political boundaries. As far as I know, animals freely move from county to county, state to state, country to country, even continent to continent without ever asking us if it's alright.