The "cockroaches" were Tutsis.
This helped the Hutus to not only plan a genocide, but also make it particularly brutal. They wanted people to be afraid for generations.
Father's were made to rape and kill daughters.
Over 300,000 Tutsi women were raped, many by HIV positive Hutu men, to ensure AIDS spread rapidly among the survivors.
The media had told them to kill "cockroaches".
In a week 800,000 people were killed in the most brutal manner possible.
The Hutus thought that they were killing "cockroaches" because the media had told them for years.
This is how a country can be divided and the brutal murder of a million people shaped as a perfectly normal thing to do.