Native children on reserves are killing themselves because of the depressing gulag conditions they are forced to live under. It has less to do with what white man does , and more to do with what natives do to each other. Living in isolation is a way of life young people simply find intolerable but have no way to escape except by running away or killing themselves.  If far flung bands could move and unify to form viable communities with access to the bigger world, rather than huddling in fear of it, there may be hope.