Bare with me,
I'm on the forefront of my own understanding here.
a) any reasons for the "if" must transcend evidence as such,
b) if there is a purpose, something in the Universe has to come aware of it at some point, otherwise it would go permanently unfulfilled, which would be EPIC FAIL.

My reasoning for this is that understanding, or attempting to, seems to be the primary activity of the rational mind, whether the brain as a whole is tuned for social interaction or not. Indeed, the most logical people tend to be quite poor at the social side of things. Not that I don't think the social side is important. Of course, we're also fine-tuned to exist in the physical world as well.

I'm basically looking at what the Universe has done so far and assumed it's leading up to something. What it's produced so far, unless our entire planet is some kind of massive red herring, is surely indicative of what it was set up to do. "Form and function," as my school biology teacher used to say.

I can't conceive of any meaningful kind of morality without some purpose to the Universe, so it's certainly of practical value to me that there be one.
( Moon Girl Technologies horrendous beanbag, Tue 16 Jun 2009, 16:07, archived)

Hmm
a) if there is a purpose, wouldn't it be advantageous (and really very little effort) for that purpose to be clearly indicated to rational minds?
b) Not necessarily, it could be for the purpose of some extra-universal being. A car engine has a purpose and no internal knowledge of its purpose.
c) That's an immense assumption, no?
d) You don't live to a morality now?
( Flapjack I spay a little mare for you, Tue 16 Jun 2009, 16:33, archived)