We are not perfect beings; we make mistakes, we believe things that end up being false, and we do things that we (or the rest of society) will regret later. As such, advocating that opinions other than the current prevailing set should be suppressed is a dangerous game to play. I know that like most of the people advocating it are doing so out of a desire to see the world become a better place. But since we've been wrong before about what "a better place" looks like, we should exercise utmost caution in telling others to be silent about their own views.