Political correctness can certainly be akin to censorship or thought control when the intent is to intimidate, stifle, or harass. That happens quite a bit on the internet, given the form and tenor of many of the reactions of those advocating political correctness. The idea is to make the other side nervous or afraid of expressing their viewpoint. Simply hiding behind "we're not stopping you from saying it" is disingenuous. If the government imposed a ten year prison sentence (to use an extreme example) on anyone who spoke against tax policy, and then said "oh, we're not stopping you from speaking, this is just a consequence of your speech," no one would fall for it. But when politically-correct types take to the internet to pillory or denigrate people they don't like, and to intimidate those who might express other viewpoints, then suddenly it's just a natural consequence of the speech and no big deal. It's hypocrisy, and most PC-types I've come across are nothing if not hypocrites.