I can sympathise and understand why people don't believe this is within human capabilities.
Look at how fractured the government and political systems of the west have become. Humans forget. We've forgotten how to build pyramids, we've forgotten the second world war and the lessons learned.
> We've forgotten how to build pyramids
What exactly has led you to believe this...?
Modern construction firms would have no problem^ planning and building you a pyramid if you were willing to pay for it.
^ well, maybe some problems like any project, but they would overcome them.
Many medieval Britons believed that Roman ruins were built by giants.
The Luxor Las Vegas was built in 1993. It even had a replica tomb for a while.
> We've forgotten how to build pyramids.
Luxor in Vegas is way more complicated than the egyptian pyramids were.
"The government sucks therefore aliens built the pyramids" has to be the line of thinking I sympathize the least with in the entire span of human opinions.