The constant bickering about scabs is infantile!
Of the remaining major airlines that morphed into the big four of today: Delta, American, Southwest and United; only United had scabs in the lineage of both predecessors.
The argument of which was worse depends largely on where you came from. United guys claim that Continental had more scabs, and the Continental guys retort 'not if you count the scab-wannabe 570'. United guys claim that Continental ALPA was more friendly to management, and the response from Continental guys is 'at least we didn't give away our retirement, our scope and furlough thousands'.
I suspect the argument won't end till the last pre-merger guy retires.
But, the bottom line is that we have a successful, growing airline which likely wouldn't be the case if the merger never happened!
So, get over it already!