Earlier quoted context omitted.
What is this word "allow"? Who forces car manufacturers to go through a dealer network? Or rather, who forbids them from selling direct to the public? Doesn't that constitute unfair restraint on trade? I'm serious here. (Non-American speaking.) Is there some law that mandates that cars can only/must be sold through dealers?
There literally is a law in every state that prevents direct sales. Check out this planet money podcast about this very topic http://www.npr.org/blogs/money/2013/02/12/171814201/episode-...
Maybe it actually protected consumers three decades ago, but now, consumers have access to more than enough information to make those kinds of decisions for themselves.