I just heard someone on a podcast say, all corporations are evil, so there's nothing wrong with buying a Tesla.
Here is the difference between Tesla and, say, Walmart. Walmart is also evil or amoral, whichever way to look at it that you prefer. Walmart does have lobbyists and is making the government worse. However, they aren't doing it the way Elon Musk is doing it. He is getting people killed and setting the poor and disabled back at probably 100 or 1000 times the rate that Walmart is.
Elon Musk is not an elected official, so people have very few levers that they can use to affect him and slow him down at all. Not buying Teslas and getting others to not buy Teslas is the only one I can think of.
In general, collectively withholding whatever money we have is the only direct influence we have on billionaires. We don't have force, and unless we work for them, we can't withhold labor.