More like preparing for the end of civil society.
My guess is that a major disruption is more likely than the end of the world or total collapse of civil society. Our infrastructure is susceptible to attack and it could leave hundreds of thousands without power, food disruptions, energy issues etc for weeks to perhaps months, that's what would be smart to prepare for. As an example, Covid - who would have guessed toilet paper would be a hot hard to find commodity. It caused near panic. Imagine no power for a month. Store food supplies stripped. I can see the value of having 1-3 months of supplies.