You know, every can has its opener.
Congratulations! Everybody in your neighborhood saw your survival shelter being installed! And more than a few talked about it on FaceBook. When TSHTF, good luck trying to keep them out!
The Twilight Zone episode “The Shelter” deals with that very subject, believe it or not.
“You mean that new septic tank I had put in? Yeah, I know we have city sewers, but I’m planning on living off the grid.”
I would rather fight defending my preparations to survive, which is already something that I planned for when preparing, than to merely die, because I didn’t prepare.
Even pioneer families had to fight to defend their goods and shelter from roaming looter packs.