Just another example of the "My house, my rules, challenge me and I will exercise my new found authority" mentality.
People exhibiting this sort of behavior should be terminated on the spot at its first showing. That's what the 1 year probationary period is for (assuming that TSAs serve a one year probationary period like other Fed employees).
If these guys were removed at the first hint of a desire to exercise authority improperly we could probably close down this Forum.