On the contrary, Alvar Hanso, my mind is always open to new information, new ideas, etc. The problem is that while there is much creativity within UFOlogy, some of it highly entertaining, not much is convincing when examined using the same scientific criteria as would be applied to
any sighting. Almost inevitably, what is left is akin to a religious belief; well meaning epople who desperately want to believe in the alien hypothesis, and simply will not be shifted from that.
BTW, W.A. Harbinson, the author of Projekt UFO: The Case for Man-Made Flying Saucers, has never claimed that
all sightings are stealth tech, etc. Who knows, if you add the book to your large pile, you just might find something that is both interesting
and credible.

At the moment ISTM that you prefer to spend your time reading material which supports what you wish to believe. If so, that is your right, but it isn't the best way to the truth. Is it the truth that you're interested in?