Any loose animal that see's your live stock as a free meal will always come back. If you want to keep the buffet open for them that's your business. Me, I raise my live stock to feed me and my family not every animal, feral or not, that wants an MRE. To each his own I recon'. Personally, I don't have an issue with killing 'em. I know that's one that won't come back. It's keeping a small problem small. Taking care of 'em one at a time. If you don't then soon you'll have 2, then 3, then,,, well you get the picture. Before you know it you are overwhelmed with predators looking for an easy meal. A small problem becomes a big problem that didn't need to be.