Wild hogs are incredibly destructive animals, causing millions of dollars in agricultural damage each year alone. Ag is one of MI's biggest and most robust industries. Aside from that destruction -- which can also be caused to public land, private land such as yards and golf courses, etc -- they carry parasites and diseases that are significant not just to livestock but humans -- brucellosis, salmonellosis, toxoplasmosis, trichinosis, mange, etc. Michigan's dairy herd are largely brucellosis free, which believe it or not actually increases people's food freedom by making raw milk less dangerous (brucellosis is NASTY). Plus, they're aggressive and dangerous. No one is saying you can't run a hunting ranch in MI, they're just saying you can't offer hog hunts. Which is a judicious decision given the implications of those hogs that escape from the ranches (which has been happening and has established a small feral population outside the ranch fences already). We can't control the migration of the hogs from south to north, we can stave off a take over from within.