In the initial post about the Capitol being shut down,t here were people saying that everyone who broke into the capitol building needed to be tried for treason and executed, or saying that the police should have opened fire and killed anyone who broke in. The mods removed the comments, but HN isn't some paragon of virtue that isn't susceptible to the same calls for violence as any other site.
No, not really. It comes down to how you define "safe haven" - if violent groups are actively moderated and banned, then I don't think it can be called a safe haven. How does the rest of the internet equate to Parler in this respect?
