However, the amount of money and energy spent on trying to convince people that “AI will take jobs”, by parties who would benefit from it, implies that these parties maybe don’t fully believe it, or believe that it needs to be a self-fulfilling prophecy.

If I am certain that I am winning, I sure don’t need to yell it from mountain tops. Unless my winning depends on everyone believing it.

There's people who go around bothering flat earthers, but despite flat earthers claiming the contrary, they're quite small in number. No mass media effort, no corporate propaganda, no CEOs mentioning all the time.

The largest it ever got were things like the netflix shows. These are pretty illustrative; All of the big attention is not so much on "these people must be convinced of the roundedness of the planet" and more on the dissection of why these people refuse to accept something that is quite easy to prove across a wide variety of otherwise unconnected experiments.