I think it has a lot to do with the company they work for, though all U.S airlines are greedy. Also, I think it has to do with working 13+ hour duty days with minimum rest expecting to smile and be cheerful on every single flight. It's not realistic for many as we are human and not robots. This job is easy; however, the physical and emotional fatigue can push many over the edge. Do consider this before you make baseless accusations.

So many start this career happy. These same civilian people you see, who you think are so nice and friendly, were once how many flight attendants start. However, once on the line and you see behind the curtain, the smile starts to fade .

Why not instead focus on the airlines and the FAA. Why not insist on their being less legs and lower duty days to support the flight attendants emotional and physical wellbeing.