Innovators are often dismissed as having outlandish, unrealistic claims. And then they succeed.
And, frankly, how are you going to hold him "accountable"? It's his and his investors' money he's spending. They know what they signed up for.
P.S. I own a bit of Tesla and SpaceX stock. It could go to zero, and I'm still happy to have a "piece" of what Musk is accomplishing.
The only thing I'm mad about is I owned some Twitter stock, but when Musk bought it I was cashed out against my desires. Though I do understand Musk wanting to run Twitter as he saw fit rather than having to listen to activist shareholders.
Musk is one of, it not the, greatest entrepreneur in American history.