Other apex predators don't have the intellectual capacity to develop abstract ethics, so they can't be held responsible for the suffering they instictively cause. But we do have the capacity, we have used it to develop our ethics, and now we're responsible for the conclusions that stem from it.
If you mean it in a sense of whether we're morally obligated to prevent predation in general - I actually think that we are in the (very, very, very) long term, but the limiting factor is the ability to do so without collapsing the ecosystem. If there were a magic wand that you could waive and make "the lion lie down with the lamb" - with full knowledge that both species would still do fine in this new arrangement - I think it would be highly unethical to not use it.
If you mean it in a sense of whether we're morally obligated to prevent predation in general - I actually think that we are in the (very, very, very) long term, but the limiting factor is the ability to do so without collapsing the ecosystem. If there were a magic wand that you could waive and make "the lion lie down with the lamb" - with full knowledge that both species would still do fine in this new arrangement - I think it would be highly unethical to not use it.