It's as simple as the people making the decisions (executives, directors, etc.) and the people driving their decisions (shareholders) have something that the employees and the customers don't:

The ability to cash in their chips and move on quickly when the time is right.

Employees can certainly leave and find another job, customers can certainly catch on to lower quality and change buying habits...but both of these tend to be slower processes than the ones that put money in the accounts of the first two groups.