Ownership, means he can do whatever he wants to, within legal limits! No trespassing, means NO TRESPASSING, and if he has landowner permission to hunt their property, I see no gripe, or ethical issue whatsoever!
Living in America, we covet our freedoms! In this case it seems you are coveting someone else's freedoms!
Even IF what he is doing is wrong, tresspassing, and/or trashing his property is wrong, and we've all heard before, "two wrongs, don't make a right!" You are not responsible for what HE does, but you are responsible for what YOU do!