Interesting piece. It will take some time to digest. I wonder about the arrow of causation for conformity back in the 40's. This essay describes WWII as a spark of a generation of conformity (preceded by the New Deal for some). But it's really hard to imagine modern society signing on to a world war. What's to stop parents afraid of vaccinations from taking their draft-age children to New Zealand? Was there something…
This reminds me of something a friend of mine told me over Christmas: Her 65-year-old uncle is not currently allowed to travel abroad from Ukraine because 25 years ago he was an Army officer and anyone with military experience is being held in reserve. So the answer to your question is simply "police at the borders".