system
Given the following post, respond as if you're commenting on Reddit:
human
[Fallout] Why did Vault-Tec bother running the Vault experiments?

It just doesn't make sense. Why risk destroying the remaining population of North America just to see what would happen if the door didn't close all the way, or if you filled the thing with world-class musicians?  

Why not fill *all* of them with the best possible candidates and make sure whoever comes out is ready to rebuild the world?  

And *who is going to see the results if everyone else is dead or crazy?* It just doesn't cotton.
gpt
As said, not every vault was an experiment. A great deal of them were made and operated exactly as intended. 

The vaults subjected to experiments were the work of a joint deal between Vault-Tec and the American government. By the mid-21st century, everyone knew war was coming. The resource wars had already destroyed Europe and the middle east just before the bombs fell, and probably many other countries as well. Everyone was starving for fuel as their machines crumbled around them. It was only natural the people with a solution wanted to make sure the human race not only survived the end of the world, but would survive what happened after.

That's why some vaults had those experiments run. If every vault had been run exactly the same, there would have been NO way to predict what would happen when the doors opened. The government, the Enclave, needed to know what would happen in every contingency and scenario so the surviving American people could rebuild America's glory as fast as possible. 

Yes, it was unethical and sometimes downright evil what happened in the experiment vaults. But the Enclave justified it by saying it would save more lives in the future than it cost. An almost... mechanical way of thinking.