That's why it's so important to let them play. They end up figuring out a lot of important things by themselves that it would be almost impossible otherwise.
It's kind of like watching kids invent society. Really quite fascinating to watch.
I don't know if they are inventing society or they are learning how to act on a society. And what I mean by "how to act on a society" I mean to learn how to interact with others, where are the limits, the consequences of your actions, etc.
who knows, maybe they come up with something better