[Symmetry]

I'm imagining a world in which the first automobeal manufacturer to try to introduce seat belts had to first convince the government that they were a good idea before they introduced them and all I'm seeing is a huge number of extra deaths for a negligible gain. Customers weren't particularly demanding safer cars back then and barriers to their development might have but the whole thing back by years.

The existing model where car manufacturers are basically free to add whatever safety features they want and eventually the government drafts standards when thing have settled down has worked very well so far in improving automobile safety.