It is possible to make speed limited cars. The fact that no one does is evidence that people do not want them. The car market is very competitive, automakers do respond to what people want.

This isn't necessarily true at all. Other people in this very thread have proposed much better reasons. Some have even provided evidence that people do still buy cars that are limited (Volvos), without any apparent impact about speed.

You can't assert that the empirical absence of data supports just one possible explanation.