I would say as far as the deer go they probally are not that bad, maybe even help a little are far as weeding out the sick and all. But here in ohio their is alot of livestock and the yotes can do alot of damage on them! One of the spots I hunt has sheep on it and the yotes take them down with no problem, eat the necks and guts out and leave the rest! So around here its kill them all, but out west it maybe leave some for the "circle of life thing" to "help" the deer heard health.