How can you do that and not teach them how to id ore deposits and how to work a mine and a refinery, to make the brass that makes the oil lamps, or how to build a whaling ship and sail it, and hunt a whale and render its oil?
You don’t have to know how to make chlorine bleach. Hobbies are fine. Extreme prep may be okay as a weird hobby, but otherwise it’s unreal and wasteful.
It is my experience that people with this type of attitude will be the first to turn on you, because they have an over whelming need to be right and when someone proves them wrong they tend to they need to punish those who were right.