Why? He's right, that was why the Vaults were so important to him, because Vault Dwellers were not exposed to radiation and therefore retained high brain functions.
Ok.. this is all in relation the the enclave disregarding anyone in the wastes. as being impure
I bring up this line of thinking, because there were peopple that were simpley walking around in the wasteland (maybe the came from vaults, maybe they ddint- its moot) that the master was able to use for making Super Mutants... all this does is show that the enclave were mis-informed on who was or was not "pure" This is my only popint. Remember the masters leiutennant didnt come tot he conclusion that vault dwellers would be ideal, until after randoms picked up from the wastes were dipped..
The master was not able to immediately discern.. how would the enclave be able to? They wouldnt.
of course vault dwellers would be ideal.. thres no hit or miss there in relation to impurity- per capita you get more bang for your buck.
But i dont assume that to mean that the
only ones worthy were from vaults- because a lot of who would be vault dwellers who were mistaken for common wastelanders would ahve been released from their vaults on average 15 years after the bombs fell, when there would still be a lot of radioactivity about.
simply put, the master was able to find pure people wandering the wastes
the enclave wanted to kill everyone not in their ranks, even those that were indeed pure.