If he doesn't think he should have the power he has, he should step away from it. It's not as though he's Claudius, an inadvertent emperor who believes in the Republic but is afraid of being murdered if he lets go of the reins. He's free to quit any time he likes and take this weight off his mind. If he has qualms about handing this power to anybody else, he shouldn't have accumulated this much power in the first place.

Truth is he likes the money, and the power. That's why he has it.