His motivation? Well he was active in politics until the DNC pushed out his man, he then immersed himself in what his local official was doing, which is exactly what our local folks are doing, voting lockstep with the GOP. Maybe he saw the loss of clean water and air, healthcare and tax giveaways to the rich as anti American since it looks like pay to play like many another Banana Republic where everything is rigged against you, maybe he had a Black friend whose family had been treated like this since they were dragged to the land of freedom where the rich had everything and the poor had nada. Perhaps he was decended from the indentured class that only got food enough to survive on and cast off clothing from dead people for 7 years of slavery. Maybe he had 58,000 of his peer group killed in nam for no reason, or had friends that were disabled vet's that couldn't get decent medical care from another silly and pointless  conflict.
Maybe he tried to live like a real Christian....powerless