...would you turn the road into a demolition derby?
It seems some fundie commenters might just answer 'yes.' Take a break to read the nihilism of a troll my circle of friends is quite familiar with.
I don't need law enforcement of the natural or supernatural kind to behave. I have compassion for my fellow sentient beings. When I'm at the grocery store, I put up shopping carts that barbarians placed in the exact center of good parking spots. If I take an item off the shelf, and the remainder are way in the back, hard to reach, I will bring a few closer to the front for the next person's convenience. And that's just the tiniest of things I do. (Need to start getting my checkbook ready for a slew of donations, by the way.)
Why do I do these things? Well, for starters, the world would be a better place if everyone was generous. Altruism helps everyone, and altruism helps oneself: People have an instinct for reciprocation:
"Scratch my back, and I'll scratch yours."
"Do not do to others what you do not want done to yourself."
It's the concept behind returning a favor. Doing kind things for others makes them more willing to do kind things for you. Hence, if I want something kind to be done for me, I should be kind to others. If I don't want nasty things done to me, I shouldn't do nasty things to others. It's probably written in our DNA somewhere. It's also taught to most of us at early ages. Even if it's not explicitly taught, we tend to learn by observation.
For the typical divine command theorist, such concepts are alien: They only know obedience, not love or compassion. They typically require bribery (Heaven) and blackmail (Hell) to reach a decision. When I try to imagine what it's like to be one of them, I think of an animal just barely intelligent enough to understand the concept of deferring gratification. This animal is locked in a cage, separated from all other members of its kind, and is promised a reward from the food slot if they hit the right sequence of buttons. They don't care what the buttons do (no matter how horrible it is), just whether or not something will come tumbling down from the machine.