If the UN could have done anything to stop this, it would have happened in the last year.
Perhaps instead of speculating about how the nation-states which have been either silently watching or actively aiding genocide could suddenly, spontaneously change course, we should focus on what we as people can do ourselves to stop this, not governments.
And they could do that, if the GA would call a Uniting for Peace session and impose sanctions, and initiate a peacekeeping mission.
If the UN could have done anything to stop this, it would have happened in the last year.
Perhaps instead of speculating about how the nation-states which have been either silently watching or actively aiding genocide could suddenly, spontaneously change course, we should focus on what we as people can do ourselves to stop this, not governments.