Gullibility isn't the problem
We're all gullible: that's human nature! In fact, it's our greatest attribute. To be able to believe nonsense is what distinguishes humans from all other animals, according to some! It's the ability to suspend disbelief that enables us to enjoy film, theater, fiction, dance... and to get absorbed in tasks of any sort, like fleshing out website with lessons for activists.
Anyhow, the problem isn't that we believe the impossible things that we see—it's that we don't call them out when they're scary and dangerous.