"But how can they with this overhang of unresolved trauma?": what on earth does that mean?

Is every Alaska Native rendered unable to progress with education--even those who had no personal experience of the boarding schools, and whose family had no such experience?  The schools were, after all, closed forty years ago.  

And how is an historical trauma "resolved"?  At what point do we say, "OK, now we aren't bothered by that anymore?"  What if you're not bothered anymore, but I still am?  What's a fair price for your bother, as compared with mine?  What if anyone who can look up what happened is bothered by it?  Wouldn't that have the paradoxical result that, by becoming educated, Alaska Natives would make it impossible to "resolve" this historical "trauma"?