Who to blame for the Rwanda Genocide?

I believe that everyone should be blamed for the Rwanda Genocide. Why everyone? Because those who knew that the genocide was about to or was occurring could have done something to stop it. But everyone decided to ignore it. When people did speak up, their speakings were taken lightly and never heard of again. In the beginning, I originally blamed the German, because they favorited a specific party and gave them major benefits that the other parties needed. After the power shifted, the favorited party did not like how things were, they wanted power and a lot of it. They started killing off Rwandans, who they viewed as inferior and pathetic. No one stopped them, so they kept killing and gaining the land from those that they killed. Therefore, because of the lack of attention and interference with the genocide, I blame every nation.