I have found that what actually goes on in the vast majority of people's minds--they way they actually work--is more subtle than that they are duped on various issues.

That is, "duped" implies that there is some information hidden from them, and that if they were made aware of that information, the true situation would become clear. That does not seem to be how it works in almost any situation.

To go back to the original post and incident, the question is how many people, when hearing about it, asked themselves whether it was real or fake? That's basically a rhetorical question and you can come up with any answer that pleases you.

If I was to answer the question and give evidence that even one single person besides myself evaluated it on that basis, I could not produce a single shred. Whether or not anyone agrees that it was fake is not the point, it is whether the question even formed in their mind.

Taking the purported incident in Yemen, I would assume that anyone who had a strong reaction to it also believes that to some extent Trump is a liar. So why didn't they ask themselves whether Trump was lying about this? Because they saw in what was presented to them that which they wanted to see and reacted to it in the way their subconscious dictated. That's how it really works, apparently.

So as I summarize the whole situation, I would characterize it not as people being duped, but as living within a level of consciousness where they create their own reality, rather than always seeking the truth. Of course, seeking the truth means you often find out how wrong you were, and that's the last thing people want.