They are just another set of expendable cogs in the logistics machine of Amazon. They are incentivized to enact and enforce harsh management practices on those cogs further down the line while being subject to similar constraints coming from above them. Shit rolls down hill so they don't get the worst of it, but they are nowhere near the top of the hill and they still have to handle a miserable amount of it.

Senior warehouse manager =\= Senior corporate manager

Part of middle-management with very little power outside following corporate policies. Might be able to do something not outright sanctioned, but the position really isn't much different from the workers in grand scheme of things.

I don't think any manager at the warehouse level is senior enough to have a golden parachute.