That's not even comparing spples to apples.
I think you've conviently forgetting that the hourly help has made the company very sucessful while Memphis chooses to sweep that fact under the rug. That said then yes employees are justified to ask for better wages whether you like it or not.
They can ask but why should Fedex pay it? They don't have to do they? Unfortunately the stock holders demand a certain numbers to be hit. It may suck but that's the way working for a publicly traded company. If you don't like it, leave.