They don't just do that for ancient peoples. I've heard theories about modern technology coming from aliens. The great minds from 70 years ago to today that developed the computer technology that almost everyone on Slashdot benefits from? Ada Lovelace? Alan Turing? The geniuses at Bell Labs? Fairchild?
If one of us make something amazing, you can count on some group saying aliens did it, and it'll only take a generation or two.
I had to turn off UAC in Windows 8 to compile and automatically copy my plugin project to its proper directory because that directory is under Programs Files. This was necessary because I had set the host program to start immediately afterwards in order to debug my plugin as it ran. This worked, but in doing so, I lost access to my Windows 8 apps. I only use a few, but it was annoying enough that I eventually moved the project to a Windows 7 machine (and you don't have to turn UAC off completely, it's just as far as Windows 8 is concerned, if that one registry entry concerning protected directories is toggled off the whole thing is compromised).
So, while any rebuttals here to the effect that "undoubtedly you can turn this off" are probably accurate, I wouldn't be surprised if there were things like this built into the system to encourage the user to keep it on. "Want to develop software on your PC? Well, either apply for a personal certificate or stop using Metro apps." It won't really stop developers, but it could shut down new user interest outside of closed markets.
The worst he could really do is paint graffiti on the Post Office.
If that's not a failure of imagination, I don't know what is. Young, "powerless" people are the ones blowing things up.