Inequity is a real thing, but I am confused about why the CEO of a company that consists primarily of low wage earners deserves a lower compensation for that reason alone. If you follow this logic to extremes, the compensation of a CEO of a company of a dozen people earning 100,000 should be higher than one with with tens of thousands of employees earning 30,000. Not all businesses are the same.
If you're looking for an economic reason, there isn't any. Politics in the US has always been moralistic since the days of the Puritans, so people prefer moralistic "solutions".