No, actually the "international community" doesn't have to respond.  Should the international community be responding to the lack of safe water on 140 First Nations?  Do you want China or the UN getting involved in that?

Is there injustice in the world? Yes there is. The problem is that Canada is involved in supporting a lot of injustice around the world and Canadian governments are inflicting injustices on their own people.  We need to fix our own injustices first before getting involved elsewhere.