i think it is disgusting.
if i met the guy concerned (thinking it would be a guy), then I'd tell him to stuff himself...
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If these animals were hunted in Australia or New Zealand, they would have all been feral introduced pests. We have mobs of deer getting about here. They used to just live up in the mountains, but they come further down now as numbers build. Not uncommon to have 50 on a crop at a time eating it.
The bloke who killed these animals probably did the environment a great deal of good. He might have took days to kill just one with a bow in the mountains, and took the carcas home for the family as venison and mounted the head. Or he might have used a gun out on the plains and got 20 of them at once and kept the best one. There is even a wild pig there.
I know a bloke who would have this many mounted heads. It doesn't turn me on at all but he's extremely proud of em. And I reckon they make the house smell a bit off.
See ya's.