There is a simple reason why people are angry. Pilots at TSA worked hard to make money for the company for years. The company then used this money to start a new airline to pick up 70 seat flying. These pilots stood up for a higher pay rate that was deserved. Instead, other non-union pilots were hired to fly for a lower rate. The new higher paying jobs, in the newer jets that these pilots had in essence worked to get, are now flown by external pilots. Thats the whole reason people at TSA were angry.
It was the GoJet pilots that chose to go work for cheaper rates than a union was in the process of negotiating. If no pilots had been willing to go, the TSA pilots would have gotten to keep the flying they helped pay for.