Because every other car manufacturer had no incentives to invest in that space when their ICE technology was working well for them. Musk made the bet that he could go big and make lots of money with that missed opportunity, and he arguably did.
Other electric car companies weren't competing because it takes absurd amounts of money or people willing to give you that money, which Musk has.
> Do you disagree that the roadster made electric cars cool, and changed public perception on electric vehicles
I don't live in the US and honestly, while I saw some tesla cars rolling around here, their popularity correlated very strong with the rise of other brands. It's almost like consumers aren't opposed to the idea of electric vehicles, it's just that until that point all options where shit and tesla finally put some pressure on that market, so the other companies reacted.
> Musk created the first commercially successful private launch company. Do you agree or disagree?
He did, and I argue that it's just like the first point, it was inevitable and Musk made the right call to invest his money in commercial launch operations because there where tons of money to be made.
This wasn't about if he started those companies, it's about the why. And the why is: There's tons of money to be made.