Wolves have a tendency to act somewhat irresponsibly in their predatory behavior. If you have an abundance of prey animals, they'll generally set up shop until that abundance becomes a scarcity, then move on.
...in Alberta, that moving on means horses, cattle, onto deer cuz the moose are all gone, etc...
A buddy I work with had a small herd of those little horses (I don't know the breed). They were basically family pets and they would take kids on them.
They started finding the little buggers eaten up. And they were being eaten alive. Horse would be down, in obvious distress, and it would have 25 or more pounds off meat gone. So they'd hafta put the thing down.
The landowner got trail cameras and set them up. But they weren't getting pics of what was doing it (initial thought was a pack of coyotes).
Eventually all six of his horses were killed, and maybe only a couple were killed out-right, four of them were still alive after the wolves had their feed. I saw the pictures. Horrible.
And they did finally get the photo evidence, off the trail cameras, that it was wolves killing the little buggers.
It wasn't all that long ago, that the story of the wolves 'sport killing' the herd of cow and calf elk was posted on here.
And I've seen how they have literally wiped out deer in some of the areas I hunt... this is because they've 'moved on' as you say... moved on from the moose herd which is decimated in the Swan Hills, to eating deer (coyotes are also a huge factor in the deer kill).
People that love wolves seems like they will never believe any of this.
And yeah, I pretty much got no use for wolves.
A dead wolf is a good wolf.