Alien tech wouldn't have just given us better jet engines, it would have provided totally new propulsion systems, like inertialess drives.

Its like the yahoos that claim the Egyptians built the pyramids using laser stone cutters and anti-gravity sleds. If that was the case, why wouldn't the aliens have provided them with concrete, the arch, buttresses and other Roman and medieval architectural technology?

What I find really remarkable is how the pyramid builders were able to organize and administer their entire society to conduct these massive projects, without computers, telephones, typewriters or any of the other paraphernalia we need to get anything done. They didn't have any high tech, but they were certainly a lot better at business management than we seem to be..

People are just afraid of death. They expect some cosmic daddy is going to step in and allow them to live forever. They are just desperate for proof that some external god is out there to step in and help them do things their "primitive" ancestors handled routinely.

Besides, we couldn't build something like the pyramids today. The software and legal costs would be too high.