A democracy need not allow free speech, nor does any other form of government necessarily exclude free speech. Indeed, in a pure democracy, the people could vote to suppress any speech they wished, and such wishes would then become law.
Your comment is really a better criticism of this thread than of my post. As this site is not run by those who merely post here, what is the point of a poll suggesting a ban? Even if people did vote that way (which, the last time I looked at it the majority were voting the other way), those running this site need not pay any attention to it. Frankly, I suspect that they will pay little attention to this poll regardless of the results.
The way free speech applies to this site is this: Broadly speaking, those who run it allow free speech in the Steam Vent. Those who don't like this fact are welcome to visit other places with greater restrictions, if they wish.
And, as I suggested previously, because this thread is about free speech, it is itself a political thread, and therefore should be banned according to those who would ban political threads at this site.