Who's to blame for Rwanda?

I'm blaming the Belgians for favoring the Tutsi's. I am also blaming the Hutu's because they're the ones who were attacking the Tutsi's. The reason the Hutu's attacked the Tutsi's was because the Belgians were the colonial power for Rwanda and was favoring the Tutsi's even though the Hutu's made up 84% of the population.