The crazy thing is we as hunters have a choice to bait and possibly screw things up. Some choose to take the baiting game to any level 1 pound of feed or 20 pounds.... does that make one ok and the other not.
What you give a ungulate may be enough to kill it without even knowing. Predation, CWD, Body Digestive System, the list goes on.
I guess until the effects are fully understood the questions will continue to haunt us all.