Without doubt it is a no-win situation.  In the lead-up to the election the media constantly stirred the pot, praising Trudeau for his stand and demonizing Harper. They asked every indigenous person in every interview if they supported a commission and of course all said yes. But they didn't follow up by asking what they wanted a commission to accomplish or how a commission would help them. 
I do feel for the families, but this misguided exercise will result in the re-traumatization of families already traumatized. 
In 1900 the expectancy of life in Canada was 47. All the problems, medical and social, that are present on reserves today including violence, suicide and alcohol abuse were endemic in the Canadian population generally at that time. We have moved on but indigenous people have not. The problem lies within First Nation society. Until we face up to this reality nothing will change.