That is NOT my argument. I am NOT saying that alien life cannot or does
not exist. My argument is that UFO reports are very much geared to the
state of technological understyansing of the people who make them. The
aruments are these.

1) No one is going to attempt an interstellar journey without
Artificial Intelligence. The ability to repair a craft that is damaged
by dust/malfunction etc. will be vital. An unmanned expedition is
likely to proceed a manned one. This being the case exploration will be
by AI. Any humanoids getting out of a spacecraft MUST be wrong. Only
possibility - Androids going to a hacking convention.

2) Atmospheric craft will be extremely reliable. No crashes.

3) Best place the Web. President Houston as I said before will simply
let them in.

If FTL (Faster Than Light) is not possible, and I believe it isn't,
then we can make the assumption that even in a billion years no one
will do it. They could travel at 0.9c possibly even 0.99 if you really
stretch a point but no more. With FTL you do not absolutely need AI,
although you do with a vengeance for anything slower. On FTL

http://groups.google.co.uk/group/sci.physics.relativity/browse_frm/thread/83cb28043cc5b2e8/1caa29f1be4ba16c?lnk=st&q=group%3Asci.physics.relativity+insubject%3Acausation+author%3Aianparker2%40gmail.com&rnum=1&hl=en#1caa29f1be4ba16c

gives the basic arguments. A better theoretical physicist would
probably have presented them differently but the bare bones is there.

If their AI is beyond what we can imagine then this reinforces rather
than contradicts my arguments.