But do they actually care about the actual health and wellbeing of the ecosystem, because they want to see it do well, or just because they want to have things to kill? I'll admit to having very strong feelings when it comes to the topic of hunting.
I'm no fan of hunting myself, but I'm no fan of stereotyping either. There are a lot of different kinds of hunters. As I already said, there are some who are just bullies wanting to kill things, but there are others who see themselves as part of the natural cycle of life and death, who believe that if it's okay for a wolf or a lion or an eagle to kill animals for food, it's not wrong for a human to do so. The former kind couldn't care less about the ecosystem and just see it as something to exploit, but the latter kind often have a lot of respect for the animals they hunt, and part of what they enjoy about hunting is being out in the natural world and experiencing its beauty.
I had a friend in high school and college whom I considered a very kind, giving, and ethical person, and I was shocked and hurt when she told me she enjoyed hunting rabbits, since I loathed the idea of hunting. We had a long talk about it, and I came to have some understanding of her point of view, even though it wasn't something I'd choose to do myself. Few things in life are black-and-white.
I can somewhat understand someone who has to hunt for food or something like that, but trophy hunting absolutely disgusts and infuriates me. Especially shit like canned hunts...
I don't think Kraven would be interested in a canned hunt (I had to look that up). What he prides himself on is surmounting a difficult challenge, taking down a formidable foe with the power to fight back. That's why he pitted himself against Spider-Man, a physically superior foe with high intelligence. So the last thing he'd want is a hunt that renders the prey helpless with no chance of escape.