Yeah, this has nothing to do with his artifact collection but his collection of certain tech knowledge along with an antenna or two.
You do not believe that Miller would have cooperated? That there is some magical property about the physical set-up at his home that he could not tell anyone about or deliver drawings or formulas about? That he is some kind of secret traitor? Otherwise, he would gladly cooperate.
Do you think they are torturing him in his basement to get the secrets out of him?
The “Secret Tech Stuff” theory is a lot harder to swallow than the “Spiteful politically correct power group” possibility. The Spiteful power group reality is more frightening.
With the “Secret Tech Stuff” theory, there is some comfort in believing that we are ruled by really smart masters who are on top of all kinds of secret stuff that we know nothing about.
With the “spiteful politically correct” reality, we have to confront the possibility that the people ruling us are concerned with inconsequential minutia and want to control small details of our lives to gain a little political advantage that helps them stay in power.