Are you a Tesla shareholder?
Additionally, there are various institutional shareholders that don't operate based on their personal opinion of Musk/Tesla, but have specific legal duties to protect their investment in the company.
The SEC could still act on the issue even if it was somehow proven than not a single shareholder actually cared.
EDIT:
> should-ing on behalf of other people is not often particularly useful unless you're already powerful.
Solidarity labor strikes, where one union strikes to show support for an unrelated striking union, would be a counter-example to this. As individuals, the striking workers are not powerful, but collectively they can have an effect.