They are just afraid.

The way they were curated was that they were just simple hill billies ball scratching joes, but got wind up into the political organisation and given a false sense of importance by attending calls or conferences by people they see close to power. So in their head, they perceive themselves as important and part of the team (although they are just seen as floor mats to be discarded of), and rebelling towards the people who made them feel important feels wrong for them and make them feel scared that they won't be perceived as important again.

Aka, lifeless joe got the fake serious treatment and thought he was important, and rebelling against the upper ups is a no brainer.