Big Hoss ain't much of an Autobot. He doesn't much care about the rights of sentient beings or the lives of little ol' aliens caught in his species' endless wars of aggression. All that matters to Big Hoss is power, and it's his opinion that the Decepticons wouldn't know what to do with real power if it bit them on the bumper.
It don't matter, though—he can show 'em what real power is. Real firepower.