Harvey@NZ wrote:

There is a vast body of information regarding UFOs and aliens.

There is a vast body of [information, misinformation, fiction, lies,
misidentity]. The problem is that for any particular piece it is
impossible to tell which of these it is.

As a non-believer - do you say that all of the above does not exist?
ie. have no validity or genuiness to them?

You already have the giving in of scientists who say, that life must
exist elsewhere in the universe, galaxy, etc etc.
Chances are there ARE civilisations older than ours, more
technologically advanced than ours - they exist. FACT.

You have a strange idea about what a 'fact' is.  It is a fact that many
have used _statistics_  to claim various things about the _likelyhood_
of life elsewhere and the likelyhood of civilisation and technology,
but it is _not_ a 'fact' that this is anymore that a statistical claim.

There is also no evidence that even if some civilisation spent millions
of years attempting to travel the universe that they ever could
overcome the laws of nature as we know them and actually do so.

You have only to screen the vast body of information of UFOs/aliens
into categories of being real and genuine, or misidentified, misled
etc.

Exactly.  And when that is done there are none that get put in the
'real' basket.

I think the question is more along the lines of..
Do you limit your imagination --- or do you unleash it to
engage in future possibilities, that are possible today.

Exactly, it is all in your imagination.