The left has become afraid of discussion. They believe that if we all talked openly, everyone would become Trump supporting Nazis.

I think it's because i few decades ago, racism, misogyny, and homophobia were far more common and accepted and 'the left' was the alternate. Meaning that in order to become left you would have to question the dominant narrative, and figure out what is true and right. Those people don't have to fear debate. Now people are raised in a world where left is the default. They've never had to ask questions like "but WHY is it important that gay people can get married? Really, it's just a piece of paper, a government document and a relic from a time when women were property. What's that got to do with two dudes in love?" They don't have a good answer for that because they've never had to look for one. "This is what good people believe, shut up and accept it." Just like fundamentalist christians they're afraid that allowing outside thought will turn people "to the devil" because they're actually very uncertain of themselves.

WE know that homophobia, racism, and misogyny are NOT morally or logically defensible, because we've checked. We never have to fear discussion.