The economy is not zero-sum. Elon getting paid (if he sells his stock or exercises his options) takes nothing from you.
Most people don't understand how top management earn money, and focus on "income" from stock growth, but the reality is that Musk is not the only one gaming the system, and the system should be fair for everyone.
Do close the tax loopholes. Do fix the perverse incentives to sink money into stock speculation rather than reinvestment (goods, labor, new production).
Fix the input, don't try to equalize the output with destructive measures.
Why are we more okay with government vs. a single individual who has shown exception ability to manage resources.. managing resources?
Especially when most people agree with the goals: solving global warming and making our species multiplanetary
And who else would own it anyway if it was not it? One of the main arguments against taxes are the fact the governement is incompetent in the ways to spend it compared to industrials who actually made money BECAUSE they were creating value.
This may not be true always, but as a french person, in this case the american governement is pretty incompetent at doing stuff for the people such as universal healthcare, while elon musk is pretty efficient at creating industries.
The incompetence of the governement and the lack of universal high quality education and healthcare is not a money problem at all... Maybe it should get itself in check before stealing efficient people's money.
(not even considering that a lot of laypeople have made more money investing in Elon's industries stock than the governement will ever do for them)