Scab, the most abused term in aviation. Let's think about this a bit. I guess that most of the rabid "death to scabs" bunch would agree that a scab is one who crosses a picket line in a strike. Now, how many times have ALPA agreed to cross picket lines of other unions because they determined that it was "not in their interest" to honor the strike. What's the difference? It's all semantics. I'm sure that some will reply, "that's different, we weren't flying struck work". Is it really? By crossing another unions picket line, aren't you negating the negotiating position of your "brother/sister" union?
I have no problem with folks acting in their own self interest. That's a foundation principle of capitalism. What I object to is intellectual dishonesty and this subject is full of it. I worked in ALPA for years and saw first hand that despite a lot of very well meaning people, that it has become a major part of the problem with the U.S. airlines. They have been unable to change with the times. I honestly believe that the classic, mainline "legacy" carriers run the risk of going the way of the railroads in the U.S. and ALPA has played no small part in that.
If ten years ago, you had gotten all of the airline management and union folks together and asked them how they could really "f**ck up a good thing", I don't think that collectively they could have done any better a job.