Aside from the fact that it would be more accurate to represent these cases based on actual population, the real issue is that this we are focusing specifically on murder rather than violence of all types.
It's been shown that aboriginal women suffer higher rates of victimization than non-aboriginal so there needs to be a fully fledged inquiry as to the root causes so we can work to prevent more crime instead of taking reactionary measures.
Victimization of Aboriginal Women
Research reveals that Aboriginal women experience dramatically higher rates of violent victimization than non-Aboriginal women do (Proulx and Perrault 2000; Hylton 2002; Brzozowski et al. 2006). Violence within the domestic context is the most pervasive form of victimization experienced by Aboriginal women. Nearly one-quarter (24%) of Aboriginal women in Canada reported having been assaulted by a current or former spouse, compared to 7% of non-Aboriginal women (Brzozowski et al. 2006). Results from other studies suggest that this figure may be as high as 90% in some Aboriginal communities (Ontario Native Women’s Association 2007).
The literature shows that Aboriginal women consistently report a rate of partner violence much higher than their non-Aboriginal counterparts, even after controlling for relevant social variables. For instance, while living common law is associated with a 13 percent greater risk of victimization for non-Aboriginal women, the associated risk for Aboriginal women is 217 percent higher (Brownridge 2008).
Sexual assault against women is particularly prevalent in Northern Canada where there is a much higher proportion of Aboriginal people in each of the territories than in the provinces. In 2002, the rate of sexual assault in Nunavut was 96.1 for every 10,000 people compared to the overall rate in Canada of 7.8 in every 10,000 people (Levan 2001). Aboriginal women have also been found to be greatly over-represented as sex trade workers compared to non-Aboriginal women (Oxman-Martinez et al. 2005; Royal Canadian Mounted Police 2006). In one study of the Vancouver sex trade, 52 of 101 women interviewed were Aboriginal (Farley et al. 2005). The overwhelming majority of these women reported both a history of childhood sexual abuse by multiple perpetrators and a history of rape and other assaults while working as prostitutes.
Aboriginal Victimization in Canada: A Summary of the Literature - Victims of Crime Research Digest No. 3