Well said Hongkongpilot.
It seems to me that those most unwilling to offer a jumpseat to a fellow pilot on the grounds of union membership and those so repulsed at the thought of sharing the flight deck with someone who chooses to be a non-member would probably be the first to shelve their moral posturing for the twelve or so hours it takes to get home on the jumpseat of that same pilot who probably offered it without even thinking of such trivial B.S. and is probably unaware that this favour would not be returned.
At the end of the day who are the guys with the most moral credibility here?
The goal of securing 100 percent union membership is certainly not going to be achieved by people carrying on like juvenile jackasses.