I think there's an important distinction to make here between how people come to believe something, and whether or not they're true. Propaganda can cause people to believe things that are true for incorrect/wrong reasons.
Are all of these believed by people for bad reasons due to propaganda? Sure. Are all of them false? I don't think so. Most of them have some truth in them, but oversimplify or overgeneralize from those facts, and nuance is important in understanding them.