True, and despite the many problems inside a union, there is no better organization which attempts to preserve the dignity of the profession, nor the prerogative of a Captain to refuse an aircraft. Also for the neophytes and non-airline people: when this happens and no spare aircraft is available, the better airlines allow safety to come before revenue. So far, there is no other group which can replace a union. Many Ppruners imply the need for no union, but they are evading the question, without a better solution. They choose to remain oblivious to the real problems.
Still off of the main topic, but the thousands of laymen who read Pprune might have no idea, and would never imagine how often many companies often attempt to place revenue ahead of safety; very few US (aviation) corporate leaders have any operational aviation background. This alone says quite a bit about their true interests and motivation$.
Excuse me for the wandering.