Only because the cancel mob hasn't also figured a way to shut down those sites and prohibit you from building a platform of your own.
Yet.
This site currently doesn't ban people just because the post is disagreeable. I've managed to respectfully discuss inflammatory topics here before, even though I'm usually the one with the unpopular opinion. On reddit people just get downvoted to oblivion or banned on sight if they post anything that offends the sensibilities of the group.
From the post itself. The subreddit was banned for breaking ToS. I'd expect the same on this site if I were to repeatedly call for violence.
Fixed it for ya ;)
A major city would have approximately four local TV stations with any kind of news organization and two newspapers. Maybe you'd have CNN if you had cable, which a lot of people didn't have. I could guarantee you right here that none of them would platform extreme viewpoints, and the country was much better off for it. I guess if you lived in NYC you'd have a few more options, but they were still pretty limited. And none of these were interactive in any way we'd recognize: maybe, at the most, you'd get a letter to the editor published if you got lucky.
The idea where anyone could say anything and be given a massive platform on an international social network that most of the population uses is a very, very new development.
Algorithm-driven social media where anyone can post whatever is actively harmful to our country. Right now, if you view any YouTube videos about WW2, you'll start getting videos "explaining" that the Holocaust was a hoax in your recommendations. If you're thinking about getting into hunting, and you look up gun reviews on YouTube, your recommendations are going to fill up with "Stop the Steal" and QAnon and other boogaloo propaganda. This is the kind of behavior that, if allowed to continue, will absolutely and utterly burn down society.
So Parler should be mandated to host democrat/left views, too, right? After all, it'd be egregious to shut down the views of so many people.
Wait, no, Parler openly and happily deletes "non right wing posts, users and forums". My bad.
Edit: every time I post a comment like this here I get downvoted. I’m not complaining, downvote away. But I have to wonder if the folks downvoting realize how much this site is moderated and how much they’re actively participating in it.