I wouldn't feed them off the porch, but if you have a decent sized property, feeding them away from the house and coop could be a reasonable option. The trouble with any kind of pest is that they only dwell where conditions are favourable for them. Killing one family of coons is not going to get rid of the problem, others will come. I for one have a LOT of cats around. My neighbors have a LOT of cats. I'm sure some coons have made their way down here, but the competition for food and space is just too great, so they keep moving.