To me, history should be preserved as a reminder of what once was, to help move us forward. I watch stuff with my daughter and we discuss it. I find, for me, that this works best. I mean I just watched a documentary about the Vikings and how brutal they were. They took slaves, slaughtered people for conquest, and I don’t hear anyone asking for the heads of people descended from the Vikings.
Human beings are not perfect and we certainly have a ways to go. Erasing history to serve the purpose of a few just doesn’t fly with me.