I'm all in favor of looking at history and the actions of peoples without rose colored glasses.
Man's inhumanity to man is something we shouldn't hide or glamorize.
Mankind's history is drowning in blood and there is hardly an empire, nation, race, ethnicity, ideology or tribe that can be found who's hands aren't dripping in blood.
What I'm not in favor of is only applying that painful and brutal process of acknowledging reality to one group of humans while romanticizing and mythologizing another group of humans.
Tearing down a civilization without a proven functional plan B has got to be the stupidest idea ever.