The article's author avoids mention of sexual abuse as a cause, but one can google up lots articles that mention sexual abuse as a major problem on many northern reserves, a problem that can lead to SUICIDE, a problem which is reportedly often hushed up, covered up, & not talked about in communities due to shame & stigma.  

Betrayal by community members and relatives, a problem a victim feels does not get resolved, a problem they may not even feel able to discuss - and you have a recipe for suicide as seeming the only way out for abused kids. 

There's likely way too much acceptance and tolerance in some native communities of both alcohol abuse and sexual abuse. Why aren't such communities instead declaring cultural war on behaviours so destructive to their own communities? Gov't programs can only go so far without community leaders and members being on board & committed to community healing, and not be in denial.