[1] https://en.wikipedia.org/wiki/Dabhol_Power_Station
[2] https://www.washingtonpost.com/archive/business/2002/01/01/b...
They are only remembered for their financial "innovations" which was ultimately their downfall. But to suggest they didn't make anything tangible is false. They even had a "Netflix" style streaming service setup with Block Buster at one point.
Enron accomplished nothing that wouldn't have happened without them, in one form or another. Agree with him or not, Musk tackles things that either wouldn't happen at all without him, or that would happen too slowly to matter.
The reality is, we need both kinds of companies, but we also need them to behave ethically.
They were not some hedge fund merely shuffling paper around. GE is a very apt comparison.
Anyone buying into Musk's vision understands that they're buying into all of it, for better or worse. Either that, or they're too dumb to be entrusted with large amounts of money, and markets have a way of handling that situation quickly and efficiently.