Even so, it is perfectly alright to have a particular view on a subject but degrading a book (or the author) for having a different view about the subject seems unfair.
Why? It's not a question of "degrading" him, it's just a statement of the facts. There have been forty-odd years since his books were published and not one single thing that he said has withstood examination. He is known to have lied about things, and certainly admits that he made things up to make his books more "interesting".
he must be commended for bringing such an event into mainstream discussion.
No, he need not, any more than any other charlatan. He presented events in his books which he said he had been involved in (visiting man-made tunnels full of gold, and special inscribed tablets, for example), then had to change that to he hadn't actually visited them, when the man he said was his guide denied that such a visit took place, then had to face up to the fact that there are no tunnels in the area he suggested.
Nobody who just makes stuff up and presents it as fact is to be commended for it.
Secondly, he wasn't even the first to peddle these stories, and he didn't in many cases acknowledge the people who he copied much of his material from - this too has been clear for decades.
Innovative ideas and the daring to imagine, supported by sound scientific facts,has been the path to success for the humans.
Exactly - that's the antithesis of Von Däniken: he's the flim-flam man, the huckster, the anti-scientist, who makes unsubstantiated and false claims, passed off as his own work, when he knows them to be false.
My point is simple: Keep the door open for new ideas - anything under the Sun or over it.
Then the ideas must be verified by logic, experimentation and observation.
Exactly, but in the case of Von Däniken and his ilk, they have
been tested and fail
the standards of logic, experimentation and observation.