Re: The question is...
Originally they didn't want to- it wasn't easy for makers in the 1920s to finance and manage dealerships in 10,000s towns and cities across America
The rules Tesla was accused of breaking was to stop a manufacturer letting a local dealer invest and build up a market, get a good reputation for service for the brand and then have the manufacturer move into the town and undercut them.
It would be as if Microsoft was allowed to let small software companies invent new products,wait to see which became popular and then sweep in bundling their own free knock off.