I'm not sure that is the prevailing attitude. I'd sat more workers are members of union than not. As previously stated its just that employers federation and the like have more sway with the media, and do a better PR job.
I also despise the way people blame unions for doing stuff, when basically they only move when demanded to do so by workers.
Still don't think there's much wrong with Dublin Bus in this dispute, but has been said its the workers that feel aggrieved.