No doubt there are many fine upstanding people working for the TSA, who don't abuse their power and are angry at co-workers that do. Those people aren't what's wrong with the TSA.

The people who are a problem within the TSA are those who deny repeated requests for water or refuse to allow a person who is not under any kind of lawful detention to use their mobile phone, for, I claim, no purpose other than to assert their dominance.

The mobile phone is potentially defensible, but I challenge you to present a reasonable national security justification for denying the not-technically-a-detainee water. Until you do, I'm going to call those people thugs.