His motivation is just... well... seems a bit out there. It's quite a leap to think the engineers can just extend life, even that they want to.
A leap? If you believe they engineered and created humans, why would not think they could also modify them. Roy Batty went back to his creator for the same reason. Weyland had the extra incentive that these Engineers may be the beings/gods that not only created man, but everything. But he was also on his death bed, so he had nothing to lose, and the money to do it.
WHAT did Shaw and Holloway find that made them leap to that basically absurd claim that we were engineered by extra terrestrials and not just potentially visited by them...
That's obvious. An ancient, tattered paperback copy of Chariots of the Gods!
The illustrations alone isn't proof of anything, seeing as it has been customary to show kings and noblemen larger than the commoner to illustrate superiority. Larger figures among smaller ones are NOT proof of aliens.
Are you forgetting about the matching star configuration in each piece of art that turned out to match a real group of stars? They had 18 years to go from that to finding a habitable moon. I'm sure a lot happened in that time.
What made them jump to that conclusion, as real scientists? The more I think about it, the less professional these people appear... almost to the point of pseudo scientists or amateur fanatics believing what they want to believe by ignoring rational thought and deduction.
Exactly, and exactly why Vickers and the company were opposed to the whole expedition. They probably looked upon the whole thing as Weyland having gone nuts in his old age, or having been brainwashed by Shaw and Holloway into believing this. Seems it was actually Weyland that conned them.
WEYLAND
I have spent my entire lifetime contemplating these questions. Where do we come from? What is our purpose? What happens when we die? And I have finally found two people who have convinced me they are on the verge of answering. Doctors Holloway and Shaw, would you please stand? As far as you're concerned, they are both in charge.
VICKERS
Weyland found you impressive enough to fund this mission, but I'm fairly certain your Engineers are nothing more than the scribblings of savages living in dirty little caves.
SHAW
If we can't make contact, why did you even bring us here?
VICKERS
Weyland was a superstitious man. He wanted a true believer on board.
DAVID
Your question depends on the understanding of what you hoped to achieve by coming here.
HOLLOWAY
What we hoped to achieve was to meet our makers, to get answers. Why they even made us in the first place.
WEYLAND
I only had a few days of life left in me here. Didn't want to waste them until I was sure that you could deliver what you promised. To meet my maker.
WEYLAND
You convinced me that if these things made us, then surely they could save us. Or save me, anyway. And what would Charlie do now that we are so close to answering the most meaningful questions ever asked by mankind. How can you leave without knowing what they are? Or have you lost your faith, Shaw?
WEYLAND
You have a very negative way of looking at things. Exactly why you should have stayed at home.
VICKERS
Did you really think I was going to sit in a board room for years, arguing over who was in charge while you go look for some miracle in some god forsaken rock in the middle of space?