You say you aren't aware that Tesla is trying to sell EVs cheaply. That is either selective awareness or you do not understand how economics, markets, and industry works. Home computers also weren't cheap, popular, and abundant yet when only single digit percentages of people owned one.
Self-driving packages are not to save the environment. It's an effort to save lives. And is an add-on and is entirely optional to purchase. If you think making the effort to save some of the 10,000 lives lost in car accidents in the US is a waste of money and effort, I don't know what to say other than I disagree.
It's pretty obvious the gasoline/diesel engine is dying. It was anyways but Tesla managed to push the industry to kill it at least ten years sooner. If you think those emissions are nothing, again, I don't know what to tell you. That is a major source of emissions that has now found a replacement and the market has forced the legacy ICE industry to move rapidly in the direction of EVs or lose profits and market share.
He isn't saving the earth. No one person or solution is. The sources of CO2 are numerous. Personally I prefer the people who get rich because they start a company addressing one of these problems. Rather than, say, Zara, or the meatpacking industry. Getting rid of the gasoline engine is a big deal. One that people in public service or other companies were unable and/or unwilling to do. You are welcome to address that problem however you like. I wish you just as much success in that. As someone who has bicycle commuted for decades and seen the to reluctance for people to adopt that even in cycling friendly progressive towns, I'm glad to see the issue being addressed in a way that accepts people's desires rather than force to change them. It seems more effective even though it is not the vision for the world I want.
Starting a car company has got to be one of the least likely ways to make money. A major US car company has not become successful since the mid 20th century. And history is littered with failed car companies. There are a whole lot of reasons to not like Musk. Risking his fortune and putting his time and effort into killing off one of the most polluting, wealthy, and entrenched industries when by far the most likely outcome was failure is not one of them. We saw quite clearly how the fossil fuel industry treated scientists and activists making global warming a known issue by making huge efforts to muddy the issues and create disinformation. But I'm sure nothing of the sort is happening regarding Musk just because his companies threaten gasoline and legacy auto industry profits. And anyways, educated liberals are immune to that sort of disinformation.
Social media is a huge source of disinformation and propaganda. Perhaps it really is best for people to rethink their relationship to is or even stop using it altogether.