> Why do people roll through stop signs?

Because coming to full and complete stop at a four way intersection when the area you are in is entirely deserted and there are zero other cars or people is stupid. We know why stop signs exist. They are very useful when there are other cars and people around. They keep people's behavior predictable and that makes us safer. They are pointless when nobody else is around though. It's still good to slow down just to be safe, but there's no reason to come to a full stop.