Originally Posted by Anti Hero
He wants to run shit. If those guys found his base they'd be loyal to themselves and eventually figure out what his secret doings are and wouldn't be loyal to him. They could even turn the populace against him. Also, killing them served his purpose of control of the people, remember his speech at the end? "They didn't have our walls!". He also got guns and vehicles from the whole deal.
It has to be more than just wanting to run shit. This dude keeps a fish tank of human heads in his bedroom