The rule is by consensus in a democracy, law is an expression of that consensus. The constraint comes from the people, the demos, and not from some tyrant. MPs

The rule is by consensus in a democracy, law is an expression of that consensus. The constraint comes from the people, the demos, and not from some tyrant. MPs are supposed to work for us, those with power wish to reduce the scope of "us" and some MPs are there specifically to enable that. But anti-democratic MPs doesn't alter the lack of rulers in a proper democracy it just changes whether our (UK) political system is a proper democracy or not.