Propaganda in and of itself doesn't kill anyone, but you're right...
While propaganda isn't a bomb or a bullet that kills someone directly, it can be used to incite violence. So yes, I didn't speak accurately. As examples, Hitler used propaganda to sway people to commit genocide, and so did others like Stalin, Mao, and Pol Pot. In a counter example, the US and British government used propaganda on their own citizens to build and maintain support for wars like WWI and WWII.
However, in this case, it appears the US is trying to influence Iraqis in a peaceful manner. It appears they are trying to incite peace, not violence. Is that a bad thing?