re: What alternative explanations might apply to Mexico's recent UFO claims? (online video clip included)
Here is one good reason why most if not all UFOs are not visitors from another world:
http://www.aeiveos.com/~bradbury/MatrioshkaBrains/index.html
I am always amazed that after centuries of UFO reports, there is still nothing more than stories and bad photographs. Amazing how none of these alleged ETI have ever once made a revealing mistake and that they all follow some kind of Prime Directive of Non-Interference with less advanced cultures such as ours.
It would be ridiculously easy for a starfaring culture to take over Earth and the human race if it wanted to. Just read Footfall by Niven and Pournelle.
