Genocides happen because of propaganda. The planners and financers and propagandists don't tend to kill with their own hands. But they command massive acts of violence.

Just one example: A radio station (RTLM) in Rwanda laid the groundwork of genocide by dehumanizing Tutsis, among other things by referring to them as "cockroaches" repeatedly. The station was deemed instrumental in the resulting murders of at least half a million people.

It's not fear mongering to look at the facts of history and see that propaganda is a primary way that violence scales. Deep fakes are another tool which will certainly be used towards these same ends. What propagandist would not want to use such a tool?