You know, you have a point. And that gravity thing - it's too strong. We don't need that much gravity to keep us from floating off the ground - the level we have means it hurts when we trip and fall down. So let's set gravity to half its current strength.
The point is, we don't live in a democracy, we live in a republic. And for all the flaws of our judiciary, it still acts as a check against renegade legislatures and executives. And it is how things work now, whether or not you want it otherwise.