semck83/Tolstoy, I share your sentiment, but I don't think you're being practical here.
It's hard to justify silencing blank, but that doesn't mean it shouldn't be done. There's little that they can do to change his behaviour, he's been warned multiple times. And he can still play diplomacy. This is a private chat room essentially, and the moderators have the right to mute people who are ruining it. They (graciously) allow free speech and even foul language and people insulting each other/the mods, but they do have limits.
Blankflag has pushed the limits, deliberately either annoying people or being oblivious to how annoying he actually is, despite being warned. Maybe you're right about this particular silencing decision/reason, but I don't think it sets any precedent about fringe views. Take krellin, for example.
Overall, his sentence structure, baffling threads, failure to engage in conversation, multiple threads about the same subject every day, all became one reason to mute him. He's incredibly annoying and people who come home from work to play on this website etc dont deserve to have to deal with him.
EDIT: wait, what am I saying? Those users could have just muted him individually. There was no need to silence him.