[clort]

If a being does something bad to another being that it did not need to do with the knowledge that it was bad and unnecessary, then morally that is not ok.

If a being does something that it needs to do in order to survive then that is morally ok, even when that thing is ultimately fatal to other beings.

There is a whole world of options between those positions, of course. We have the equipment to eat other animals because we evolved that way and in the past we needed to do that in order to survive. That we may no longer need to do so is where the moral quandry comes into play.