As a business owner I'm pretty solidly against unions - they aren't in my best interest. As an airline pilot (regional or mainline) I think I would rival ATN, Surreal, and Seggy in my pro-union feelings...for the exact same reasons - it is in my best interest.
One thing I've thought and wondered: My THOUGHT (uneducated opinion) is that ALPA (and other unions - SWAPA, APA, IPA to some extent, with ALPA help) have furthered the cause of safety. This is a hypothesis and not based on hard knowledge on my part but rather a "hunch".
Question: Forget the obvious benefits of job-security issues/pay for a moment (although they certainly can have a piece of mind/happiness safety quotient) - can any of the union wizards on the thread tell me: a) what safety advances have occurred largely because of ALPA/Unions and b) has there been a study made of incidents and accidents both "pre" and "post" unionization of a carrier? If so, what do those studies show? Further, if you dig deeper into the data are there efficiencies that occur in terms of training events (fewer failures/better performance = lowered training costs) or any other operational improvements that can occur after a union is brought onto the property?