Miners en-masse currently can decide to block transactions. With something like an attachment process this would become impossible as the word was spread about a tx being censored.
I'll just keep bumping this thread every week or so.
They can but they don't en-mass, because if they did this means that bitcoin itself has failed, since we then have a collusion of majority hashing power.
For the sake of argument, let's say you're right and that
is occurring now. What exactly does the 'word' being spread about censorship actually accomplish? Since the majority of hashing power are colluding, they can do whatever they want, and no amount of social engineering will help that.