He is worshiped from afar but reviled by many the closer you get to his inner circle. Go read "Elon Musk: Tesla, SpaceX, and the Quest for a Fantastic Future."
The question I always ask myself with the people who move mountains is what cost did that progress come at? What would someone's spouse, kids, friends, etc. say about the person?
I'm actually highly concerned about Musk's overall effect on society, specifically due to the kind of people he'll have that effect on.
Elon definitely is not a fluke like you imply. He is not the best eng but it is his relentless work ethic (read: no other timesink in his life at all) that puts him above the others. Have you ever worked more than 100hrs a week? I don't even think I've managed it once but Elon does it every week. To admire elon, you must first understand what that means.
You say he has only had one successful venture but before Paypal he sold his company Zip2 to Compaq for some 300M. Then he started x.com, which only later merged with Peter and max's company. Elons x.com brought more than 50% of the staff. This means that he was a huge component in Paypals success no way you cut it.
We have established that he is no fluke, now lets examine your criticisms of Tesla and SpaceX and why you should not have them at all. Tesla is not perfect but there is absolutely, 100%, no other way to have sustainable transport than electric cars. Even if Tesla used child labour with huge workplace accident rates, you should still support them, because no matter how you cut it, we will destroy our atmosphere permanently without huge electric car adoption. Nevermind all of the other parts of the power industry that are hugely polluting.
On to SpaceX. They are saving taxpayers millions of dollars every year by allowing governments to cut satellite launch costs by 4x over Boeing or Lockheed.
In short:
Elon is not a fluke and has super human work ethic Tesla is our one shot at everyone not dying en masse by the time I'm in 40s (head in the sand if it soothes you but thats the case) SpaceX saves millions of taxpayer dollars every year.
You should be advocating for international cooperation and government action, not a company that creates electric sports cars.
Government is like Thor's hammer. If you can wield it, you wield tremendous power.
Think of mega corps as Thor, wielding the hammer. This is how government works: A mega corp pays for politics to happen in a certain way, and thus change happens at huge scale through taxpayer money.
However, you may not wield the hammer if you are not Thor, because it's too heavy. Analogously, lobbying is too expensive for small players, and to be a politician advocating risky things without a huge payout is career suicide.
Advocating governmental change is a nice thought, but how government actually works is by having enough cash. Be a huge mega-corp and then paying lobbyists that pay people inside of government.
Or, you could simply grow a company and do your best to be completely independent of government while stile abiding by their rules and operating under fair laws. That's what Tesla is doing.
And we need your help, stranger, because time is running out super fast and there are millions out there making the same misjudgment that you have here, but some of them are a genuine threat to Tesla's fate.
It is a race against the clock to get everyone behind this guy.