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.
The solution is an emergency hard fork to another mining algorithm which renders so all of the miners' equipment useless. This has been discussed before and it is a solution if miners were to be colluding to the detriment of bitcoin.
Op, the problem is that if people's transactions could be made dependent on another person, they are not acting to their own interests. Buy linking their transactions to the censored one, their own transactions will also not confirm and that is detrimental to their own interests.