FA is a tough job. Too many fast food meals, or worse, airplane meals. Too much time away from home. Too many nights in bad hotels. Too many difficult flyers. Too much "security" and worries.
It is a responsible job as well. It is about passenger safety not just serving drinks or meals.
That said, their pay scale likely got pushed over the top and it is time for a readjustment. If they keep acting as they are and trying blackmail tactics, there will soon be a time when mostly foreign FAs are flying USA domestic routes.