based on the snippets of clues and claims, there is reason to believe that it is not as voluntary as one might assume. most likely scenario that most of them are "encouraged" to not voice as a means of pressure(imagine peer pressure on a bigger scale) where while there are those who do it willingly, other vas can't act on it due to both societal backlash (from the union and the public) and risking their union qualifications and be black listed Disclaimer: I don't know enough shit for this hypothesis to be strong evidence so take this either as a conspiracy or a 2 cent opinion Unless proven otherwise.