Opsec is one of those double edged swords.

Too much and you are going it alone, no one to trade with, no help.

Too little and you end up on “Doomsday Preppers”.

You said this good. Mistake is that people want solve the problem on quick way, so they want to tell the world immediately that they are preppers, and how it make sense to other folks to be preppers and so on…
Or on the other side man decide that he just want to go trough everything alone, “lone wolf” and that s it.

Best way should be to take your time and invest lot of effort to search and evaluate who could be good for you, it is slow process, so it should be started while there is still time.