Spent an awful lot of time around, hunting, and trapping wolves in the past. Instances of killing for sport, an activity our species loves more than any it should be noted, are incredibly rare. You need a lot of factors to come together, as wolves are above all else subscibers of the efficiency model. They put out as little energy as they can for the most reward and the least risk, you see this in how and where they hunt, which is where you go when you want to hunt or trap them.
Sheep are soft targets, and go against everything a wolf has evolved understand. They’re bred to be placid and unthinking, they rarely fight back, and they’re fenced and unable to escape. I find it no mystery wolves will surplus kill in a scenario like that, just as humans do when given no bag limit. Think caribou in the past and present day in the far north for certain groups, market hunters and waterfowl, bison hunters on the plains. They go hard where the going is good and they face little resistance, and you can’t be surprised they’ll kill too much when faced with that scenario. Their evolution is for a far harder life.
That doesn’t mean they get a pass when killing livestock and over pressuring wild game, quite the opposite. It doesn’t however make them dispicable. Leave a wild place to the wolves, or leave it to humans, and every single time the wolves will manage it better. My real beef is we’re losing the wilderness, and what’s in it, and that’s not wolves fault.