An earlier post criticised the attitude of some Union members... One of the things often overlooked concerning Union leaders is that they have a DUTY to act in the best interests of their members. Rather like lawyers defending those accused of the most unspeakable crimes. AS a result they may have to take a stand on behalf of others that is not completely in line with their personal belief. (I'm sure the same can be said for many; doctors, soldiers etc)
It would be wrong for lawyers not to do their best... and it would be wrong for Union leaders also.
The trick is to get the balance right between the "short term" good, and the "long term" good. Not an easy one to pull off... and success can't be judged in the short term anyway. It's always measured in the long term!