Because we all know that the radiation from anti matter powered space craft and environmental suits worn by aliens interfere with the functioning of the frontal lobes, turning normal people into crappy photographers?
Also, why can those e.t. schmucks fly all the way across the galaxy here, but are unable to keep the damn thing hovering steady in the air for two seconds?
When an airplane is so high up that all you see is the trail of it, you are viewing an Unidentified Flying Object. You know it's an airplane, but you can't prove it simply by viewing it from afar. Or: You know it's an airplane but you cannot idenify which airplane it is and where it is from to where it is going. Thus it is unidentified.
I realize you're being sarcastic, but I'm just saying that UFOs does not equal aliens in saucers to any potential nimrods that think otherwise.
Like-wise I wasn't aware that opposing the notion that all UFO sightings are from "burnt-out hippies" - a stereotype which I believe is largely American anyway - means I am some raving UFO-nut; its a lingering cultural
stigma stereotype no different from any other stereotype which has unfortunately become increasingly international, all the large UFO cases in the UK (Rendelsham and Brewyn for example) have already been disproven.
I am fully familiar with what a UFO is - though they are officially refered to as "Unidentified Aerial Phenomena" with the UK Gov't - and I'll have you know that I don't believe in extra-terrestrial visitations to the Earth by aliens; like-wise I am not so close-minded and reactionary that I won't dis-miss the idea based on the common consensus.