Make no mistake, they "enjoy the suffering" of wolves. It's not bad enough that they wantonly kill these American iconic and majestic animals, but they also want them to suffer first.
A gut-shot animal is an animal in a lot of pain who doesn't often die right away, but can live for over a week or so suffering the pangs of hell--the animal will eventually contract and die a slow, agonizing death from a gangrenous infection.
The killers know this and do it because they know the wolf will suffer. Why? They have to be very twisted sadistic subhumans, and that is more of what our wolves are up against.