Ever seen a man go flying out of a car almost the length of a Football field and slam head first into a house, nearly missing a window, killing him instantly because he didn't wear his seatbelt? That's why certain laws are on the books. Now go sit down.
Ever seen a car smashed by a deer? Roadways without barrier fencing represent an equal threat from wildlife as from traffic especially in rural areas (where deer roam). Your assumption that the State knows what is our best interest at the expense of our Natural Law right to choose for ourselves, is insulting. We don't serve the State - the State (should) serve us!