It is a different situation when you are presenting information quick in your job through a video. Of course you wouldn't make someone read information in a presentation in book form.
However, when you do research for your job (if you do so) you do not learn from videos. You data mine mostly documents. You read.
Books contain much more information than DVDs. When someone says that they can't learn from books or just learn better from DVDs, they don't give books a try. Books are the best way to educate yourself, whether you say you learn better from DVDs or not is irrelevant. It is a matter of applying yourself.
Maybe when YOU do research for your job, you don't do it from videos. That doesn't mean everyone else does. My job involves security and reading people's gestures, emotions, mannerisms, and tells, if you will. Of course you can read about these things all day long, and you will start to understand what it is you're supposed to be looking for. But once you are SHOWN what these things are (via recorded video or setup acting) you can really begin to understand what it is that you are supposed to be looking for. In my area of work, the book can only take you so far. The visual learning of watching these things takes you to the next level.
You completely contradict yourself in your own post. You say "Books are the best way to educate yourself." You then say "whether you say you learn better from DVDs or not is irrelevant." That's about the most ridiculous thing I've ever read. If someone learns better from DVDs, then to THEM obviously books are NOT the best way to educate themselves.
Stop trying to use your OPINION as FACT. Just because YOU learn more at your work by "data mining" doesn't mean that I learn more at work by reading. Just because YOU feel that books are better teachers than videos doesn't mean that everyone else feels that way.
So in closing, your opinion is just that...your's. Like I said before, it's not right or wrong. It's your opinion. You don't seem to be able to grasp the concept that your opinion is right for you, but may not be right for someone else. Of course everyone is entitled to their own opinion, but if you're going to have one you should be open minded enough to understand that others might not feel the exact same way as you, and you should definitely refrain from assuming that you know what's best for anyone else.