As you point out, the people have already turned against one another. This is just harnessing that pre-existing animosity in service of enforcing the law, since it seems the police simply don't enforce the law anymore. People have realized it's a free-for-all, and routinely violate all sorts of traffic laws, knowing that the police are basically doing nothing anymore. I did the math here in a past post I can't find, but concluded: If I could stand by the road with a camera, report all incidents of cell phone use while driving, and get just 10% of each fine, it would be a substantial percent of my income. That's one single law on one single stretch of highway.

Yes, it sucks that people are against each other, but the root problem is lawlessness, and that the people whose job it is to enforce the law are off doing whatever else.