There are moderated lists. When someone gets out of hand give them a temporary ban, and tell everyone why there were banned. People will learn that if they want to participate they will have to behave. After time, when the community scares away the trolls, they can loosen the moderation rules. There are plenty of communities that self moderate after having a strong leader show them what was socially acceptable and what was not.

It's not necessarily about misbehaving. You can "behave" and yet still derail a discussion or provide no useful input. I'd say there wasn't terrible uncivil about the internals list.

But it's less like a technical discussion list and more like an open forum. The signal to noise ratio is pretty low.