Left wing is plenty upset by the fact that the right wing exists and is allowed to speak. And tries to shut it down at every opportunity. It's not easy to shut down Fox News though, first amendment still being alive. But it's much easier to get a rightwing speaker to be banned from campus, or Facebook or Twitter. So that's what they are doing, for now. Until the government finally passes that "fighting the misinformation" law and packs the court so it wouldn't mess with it - then the sky is the limit.