This is the opposite of trickle down economics. Trickle down says that you should give money to rich people first, so that eventually it finds its way to poorer people.
Tesla's model is to take money from rich people first, to fund research that eventually helps poorer people too.
You are completely wrong.
Tesla isnt a government entity taking money against people's will. They are a company selling a premium product to wealthy people. They are reinvesting that money to refine their product and make more money. If they are successful this will have an economic ripple effect that will produce more jobs. The government has been supporting this by taking money from others to provide loans to the company and tax incentives to the wealthy buyers. If that isn't trickle-down economics I dont know what is.
Tesla will produce an inexpensive car when (1) it can be done profitably and (2) they want to be in the business of dealing with many low-margin customers instead of few high-margin ones.