The people saying “both sides” are not trying to understand history or learn from it. On the contrary - they want to preserve some fantasy version of history and their white identity while pretending slavery or the Holocaust were not so bad. The Both Siders of today were the Good Germans of Hitler’s Germany. I honestly have no idea how you can argue that liberals or progressives or whatever label you want to attach believe in shutting down discussions about root causes of anything. The fact that Trump supporters can’t possibly see themselves as the Good German because Trump doesn’t have the caterpillar mustache or wear a Nazi uniform is a perfect example of a kind of willful ignorance of history and an inability to ever connect dots.