Hmm, let's see...
Falling stock + rising fuel prices + inability to realize planned merger synergies or to execute another merger to delay same + complete lack of competitive advantages relative to other domestic carriers + CHAOS or "rolling thunder" seems like a recipe for serious financial disaster (fire sale or Ch. 7) for US.
Obviously the unions in this country still fail to grasp the big picture when it comes to the long-term price of near-term victories. Granted, the arrogance of US's management has led to a situation of "you reap what you sow." But I see no benefit for the US pilots in this situation other than "rolling thunder" offers them a way to blow off steam which is a strategy that has obviously worked so well for organized labor in recent years.
In any event, shareholders have reason to be aggitated, and I'm certain that most of them could care less about the feelings of US's pilots with the stock on its current downward trajectory.