You're assuming the shooter was the legal property owner, it's not clear that he is.
As long as the place was his home, rented or owned he had a right to tell anyone to leave.
Looking a property records, there is a home owned by Johnny Bob Carruth and June K in the area where the shooting reportedly occurred. It wouldn't surprise me if Kyle Carruth was living with his parents while his divorce was being finalized and this was where the shooting occurred.
Remember why, specifically, the Bill of Rights was written...remember its purpose. It was written to limit the power of government over the individual.
There is no believing a liar, even when he speaks the truth.
