The secret to American propaganda is that everybody gets to be a propagandist. Targeting isn't used to simply deliver the right messaging to each person, targeting is used to get people to repeat the same propaganda for different reasons, while not caring whether it's true.

Thus, the 'China threat' narrative is the same everywhere, but people are recruited to repeat it based on different reasons. Some people think it'll help revive American industry, some think they're sticking it to 'Beijing Biden', etc. None of them care whether it's true.

Each person pushing the 'China threat' thinks they're doing something very clever - they think they're using propaganda rather than being used by it - and this leads them to go along with it in an especially unreflective way, since it doesn't have to make sense for them.