Control the Joker? He's guaranteed to lose if he's arrogant enough to try that. Hell, he outright deserves to die if he tries that idea. Even Lex, who knows the Joker very well, knows better than to try and control him.
Everybody laughs at the clown and dismisses him as a threat. And then you realize he's right behind you with a gas bomb full of joker venom. As The Trickster said: "when super-villains want to scare each other, they tell Joker stories."