As we don't have a science to explain it you can understand why it has appeared both magical and mystical to us humans. And are you saying that just because we don't understand the science of the UAP that we should not pursue any other avenues? Should we also burn the heretics? How do we progress through uncharted waters without imagination? What did Einstein say about imagination?
You might be missing the point of how scientific progress works and has worked and been delayed over the years - close minded belief systems would still have us at the centre of the universe and all things revolving around us. And the heretics, the free thinkers and inventors would be dead or silenced.
I used to beat the UFO science drum a lot as well until I realized that the best progressive thinking was imaginative and it was also scientific in its approach. This problem requires expansive thinking and not regimented blinders so that the horse can only focus on carrying the load. It does need wild minds trying to catalogue and categorize what is certainly a very diverse phenomenon. Anyone who thinks UFO's are only space ships from another star system has not been reading the case studies. There is a range of experiences and there are many incredible possible crafts.
Should we be stuck in a 1960's mentality on this point, because if so then we met be missing out on the fact that panet earth is obviously a hotspot tourist destination for hundreds of different lifeforms, or their camouflage keeps changing. And if we are not going to study the psychological, physical and sociological impact they are having through other disciplines (not comics or sawing people in half) then we would be pretty ignorant and short sighted about it all. You name me which idiot of a close minded scientist that doesn't study the effects of a process or chemical reaction in order to try to deduct what's actually taking place?
Just because we can't see germs doesn't mean we should call them fanciful inventions of the mind, same goes for gamma rays, the composition of the air you breathe, the effects of sunlight at the cellular level and countless other invisible processes. But if you want to continue banging hammers together go for it. Vallée is not anti-science - he's freed up scientific thinking to allow for the possibility of other sciences we've just started to consider to be applied.