This was a good example, but I think you probably missed a part of the message. Or maybe I am imagining a part that did not exist.

Generally, people are speaking imprecisely. To state one's opinion with a mathematical precision as you did, is rare. (For example, writing this paragraph I would have a problem to precisely define what "generally" and "rare" mean in this context.) And when normally speaking, people tolerate this. ...uhm, usually.

Asking people to be precise is also a signal of something. We usually don't demand perfect clarity for every sentence we ever read or hear, even on LW. I suppose we usually demand it when we disagree with one's opinion.

Placing a burden of preciseness on some people or some opinions, provides their opponents cheap counter-attacks, when they don't have to discuss the argument, only point out the impreciseness.

Now, carefully crafting one's comments into precise sentences is possible, but has a non-zero cost. So by selectively asking people, whose opinion we don't like, to be more precise than usual, we make them pay for their dissent. All while pretending that we only care about the truth, without taking sides.

Of course, people learn that they are asked for higher precision only when expressing certain opinions, so if they want to avoid the costs of such speech, they avoid the sensitive topics. But that's the point, isn't it? By increasing standards of speech for certain opinion, we gradually make it disappear.

I think that people often feel when this is done to them, but it's kind of difficult for them to express what is happening, without seeming kind of paranoid. Also it's kind of difficult to express your feelings in a situation when an extra dose of preciseness is required.

Summary: It is possible to selectively use demands for precision as a form of censorship.