I think this might be a good approach.   History is rife with men and women who, at the time, were viewed as having done great things, but who also did horrible things.  I can't see Americans getting to the point where they tear down the Jefferson Memorial,  but a plaque noting that much of the privilege that he obtained was on the backs of slaves and that he likely was a serial rapist would put him in a different light.   The same goes for monuments in Canada.   For example, we shouldn't tear down the monuments to Queen Victoria, but it might be worthwhile noting that she subjugated vast parts of the world to enhance the wealth of her own people.  Similar historical explanations should also be made regarding monuments that are currently attracting attention in Canada;  for example the horrors that Cornwallis inflicted on indigenous people and the fact that Begbie, although in some respects revered by some indigenous peoples, also sent six chiefs to to their deaths.