The reason those predator species got killed to near extinction is probably a bit more broad and ugly than just concern for lifestock.

But you're correct of course that the main reason for the current overpopulation of many non-invasive species is a lack of predators and they should be reintroduced. But that's also not a thing that can happen from one day to the next, so even in the most optimistic scenarios some degree of human wildlife management still has a purpose.

Many farmers growing plants for animal feed. Also there are Deer farms that raise deer specifically for the hunting industry.