I agree with rocket21. Most countries around the world understand this, as well.
It helps understanding to look at the larger picture, taking off the tunnel vision blinders. Wars of conquest, where one group conquered another group and took their resources (land, water, crops, livestock, women, children, etc.) have been going on throughout recorded history, all over the world. Obviously, this was always wrong, and bad behavior. Absolutely every "identity group" one wants to "tunnel" into has some of this in their history, at some point. Denial of this is simply a propagation of the old "noble savage" myth.
Thankfully, today, wars of conquest continue in only part of the world, not the whole world. Yes: the Russians are conducting a war of conquest in Ukraine; the Chinese are conducting a war of conquest in Tibet; wars of conquest are going on in several places in Africa (Sudan, for instance). But on the whole, the world is a much better place in this regard than it was say 500 or 250 years ago. Our focus today should be on getting nations and groups to stop doing this now, in the present, where it can make a difference.
So to rocket21's point, leaders should be remembered for the good, and the bad that they did. Memorializing leaders should rightly include context. But labeling past people as "murderers" based on the world's culture they lived in 500 or 250 years ago is inappropriate. By that logic, all mankind should be so labeled, and we should hope for the great asteroid strike to exterminate the species.