Dehumanization
Refusing to believe that your target is human, instead somting hidous that everyone hates. Often referring to them as animals, vermin, or diseases. when you are calling your enemy a rat or cockroach, it seems much easier to kill them because you are not thinking of them as a person. To stop the uprising, the hate proaganda and raido stations should be shut down. Also the new and old laws on hate crimes should be inforced and promptly punished.
By dehumanizeing the Tutsi to Cockroaches, it makes it easier to see them as an entity that needs to be exterminated. If you can truly get the people to see the Tutsi as cockroaches, it will be easy to kill them withought remorse or compassion. Also in the Holocust the Nazi's consided the Jewish people to be sub-humans to make it easier to muder millions withough question.