Using the somewhat centralized default trust system to 'threaten' people with dissenting beliefs is not consistent with the libertarian beliefs bitcointalk was founded on and the values of free speech.
Libertarian bullshit again, ain't it?
And it is an abuse of power and a threat to free speech.
This has nothing to do with free speech. You can post the same way that you would regardless of the state of your trust rating. Any change in such would be a decent indicator of hidden motives.
He can continue writing, but users who share unpopular beliefs are now more afraid to express them, knowing there's is a possibility they will get red-tagged!
Unpopular =/= objectively false (a.k.a., a lie).