In fact it does not. Governments exist solely to provide for people. Everything else you've heard about -- companies, organizations, interest groups, etc. -- are fictions that exist to help or hurt the interests of individual people.
What you have in car dealerships is a classic example of regulatory capture [0], where most people don't buy a car that often, so they're not particularly focused on dealer laws. But dealers have all the incentive in the world to lobby for restrictive rules. And, since dealers are by their nature distributed, and often have the proceeds to be "good community citizens" (e.g., sponsor a little league team), their views have even more weight.
What you have in car dealerships is a classic example of regulatory capture [0], where most people don't buy a car that often, so they're not particularly focused on dealer laws. But dealers have all the incentive in the world to lobby for restrictive rules. And, since dealers are by their nature distributed, and often have the proceeds to be "good community citizens" (e.g., sponsor a little league team), their views have even more weight.
[0] https://en.wikipedia.org/wiki/Regulatory_capture