re: Thanks for the answer Tom: Probably my question
a) You have not read any of the books that contain purported explanations by purported observers of such "craft".
b) If you have read or heard about such books, then you can not understand the "physics" that may underlie the explanations.
c) You have some other (perhaps religious) objection to the existence of extra terrestrial intelligence.
d) You fear that which you do not understand.
e) You believe other people when they say that such books are not of any value to anyone.
a) Yes, I have.
b) Yes, I do.
c) No, I don't.
d) Not really, but I don't assume my not understanding something means it isn't bullshit, either.
e) No, I can decide that for myself.