I know right were this is. It's about 45 minutes from my place. Grand Blanc is a Flint suburb, almost directly east on the South Side. Been to the "nearby hospital" more than once. Basically it is just inside the civilized edge of Thumb Militia country.

Looking at the truck with the American flags hanging from poles in the bed (everywhere in the rural areas around here) - right wing nutter with a revenge for Kirk motivation is my solid bet.