Thats the sad thing about trophy hunting... they probably only shot it for the antlers to tell their buddies they shot a big-bastard.
This is not about trophy hunting in the usual sense, but rather trophy hunting for profit. Many of these poachers have a market for the mounts that are harvested and don't keep them for bragging rights. It is much more common in the western states than here in the east especially in Montana where it seems to have become a major business but it happens here in the east as well.