With the animals we consume, since they are killed out of our sight, we can pretend that they are treated with respect. I'm pretty sure everyone would be disturbed by a video of a couple having sex on a freshly killed cow, which is afterwards torn apart by many hungry dogs.

The person (people) in question killed for pleasure and then proceeded to degrade the killed animal. In my mind it's the combination of these two factors that tips the scale to disturbing.

So they kill the bear.. then they fuck they bear. Then a pack of dogs tears the bear apart. That sound any different?

Then leave FFS. Being a vegan is a choice. Just as reading the article is. Just as the article states, his work was completed voluntarily.