There was a time when I read a stream of articles and blog posts titled something like "I'm a liberal, but I agree with ... <obviously far right thing>" After reading enough of them, I realized the common structure was to state a number of relevant facts, then make a leap across an unstated and unsupported premise, hoping the reader won't notice. The final section would assert the conclusion based on this premise.
Zecharia Sitchin’s arguments are also frequently not good but he at least seemed to be trying to construct a consistent whole whereas these other guys will just say anything.
I like fantasy, but it should be at least a little bit consistent.
What Von Däniken did teach me as a child was to have a sense of wonder about the ancients and their achievements. Maybe not spaceships and electricity necessarily, but their feats of masonry and sculpture. I've seen dolmens capped by stones the size of a bus, that I felt uncomfortable walking under, even though they had managed to stay like that for thousands of years. We struggle to replicate some of these things today yet they apparently did so without metal tools, proper ropes or any number of other things. The planning alone would have taken many years.