Doomsday Preppers....?

I am watching "Doomsday Preppers" on NATGEO.   I see the different situations and it gives you stuff to think about.  But the "if" the big "IF" is "why advertise"?    If I am prepping..I don't tell nobody outside the family.   I practice OPSEC.  If the government knows, so will other people.  That is not a good thing,   All you would need is "da Man" to come by and seize your guns and lock you up.  Then you will lose your stash because since you are locked up, you neighbors will come over and pillage your house.