The non-cult bassa members
In response to the question about why the other bassa members - the ones who are not a part of the cult, appear to do nothing, posters need to "think themselves into" the position of those non-cult members.
Firstly, CC jobs are not like other jobs. There is no 9 - 5, and the cameraderie, such as it is at present, is different. It's not the same workgroup every week. Each "job" involves a different workgroup. Compare it to lots of very short term projects, with different project leaders, not many of whom appear to support the company.
Also, the "managers", (other than the Heritage CSDs, who appear to be a very mixed bag of folk from the very good to the other end of that spectrum), are invisible to many crew.
So, you turn up, you do your job, you may or may not socialise if away from home.
What's there to bind you together? Well, as with many employers, moaning about the boss/employer is a good start. Having fun with colleagues is another. "Belonging" to the TU (was) a more or less mandatory part of belonging. So even if you have no intention whatsoever of striking, you are unlikely to resign from the TU.
Many people use their jobs to give "meaning" to a part of their life. If for 40 years that "meaning" has meant being in the TU, then you don't change it just due to this little dispute.
Also, as others have said - many folk still belong to TUs due to the notion of "Insurance" or "Just in Case".
As any half decent academic* will tell you, NO TU can live up to the "Insurance" promise. They are simply not resourced enough. Even Balpa, which is the most expensive TU, cannot resource all the claims on its time. Unite stands no chance of ever resourcing all the potential claims on its time. However, they neglect to tell you that when you join, and once you are in, they do not tell you that.
*"Half-decent academic" does not include the twits from places such as Middlesex Poly who wrote in to newspapers to bemoan BAs approach to ER. Other than the usual list of Trots and TU sponsored Pinkoes, the others were remarkably dumb to add their name to a letter without getting some information first. And the UK allows these dimwits to educate our children???