We are outraged by the conduct of people in prior generations. What evil are we perpetuating now that our descendants will be outraged by? That is what we should be focused on.

It's much easier to look at evil from a safe distance; we can feel righteous. When the evil is in the mirror, there's no feeling righteous; it's much more complicated; but we can do much more good by actually stopping it now and rather than feeling bad about it later.

(I completely support also researching and addressing what happened at the residential schools. I'm saying that's the easy part.)