Those who read very little are the ones vulnerable to manipulation

Was that for reading for enjoyment or for information. In my experience I find folks who prefer written documentation over video explanations tend to figure out and perform things better. I also find those who mostly get their information from videos have a hard time understanding and doing due diligence on sources and thus tend to get emotional over things that are not entirely true or presented in a very slanted light. While you can rewind to double check something said before in a video I find few people, including myself (and I likely do do it more than most) will bother to rewind and do the double check. When reading its much easier to page back and check that item. Its also way easier to assess data from multiple sources and you can chekc particular parts of writings within minutes easily wereas finding and checking areas of videos where they all talked about the same thing is not so easily. Even scrolling around a forum or search for things is easier. Heck searching to get text is much more likely to quickly find you something than search video for a specific thing.

It's not hard to believe. The brain is wired for visual memory.