compare to the average salary of one of their shareholders?

If your retirement is in a mutual fund, you may indirectly be a shareholder in one or more of those companies.

I hope my retirement is invested in responsible companies that, with reasonable limitations, try to maximize my retirement.

Now I would be impressed if those CEOs started donating a sizable portion of their own salaries to charities(particularly those charities they do not control). I think people should virtue signal with their own money.