Not true in the respect that if something catastrophic was to occur during day to day routines where-in you are within yiour living bounderies. Yes a sharp mind is great yet if the literal shit hit the fan and everyone was starving, fuel was at a premium and rare, and luxuries became bottled water instead of who has the biggest tvs, a sharp mind will be shot dead for a can of pork & beans
You are thinking natural disaster situations..... plane crash.... last time I knew you could not take a gun onto an aircraft...... if I was stuck 10,000 feet up a mountain in a cable car maybe I could fire the gun to get someones attention or if we got off I could shoot the pissed off cougar who was going to attack one of us

Submerged train with water rushing in--- place gun against glass and shoot the fucking window out to escape biatch!!!!
with all possible scenarios my chances of living are increased if I have a gun.... whether it is a big fucking one or not
