Well, duh. I'd carry everyday for 25 years in the off chance that ONE DAY IT MAY SAVE MY LIFE!
It is the same reason I have fire extinguishers on each floor, 2 weeks of food and water, insurance, maps, cash, etc in case of emergencies. I hope to never use them, but will be damn glad I have it if SHTF.
After Nolan's wife dies in childbirth during Hurricane Katrina, his newborn daughter is placed on a ventilator. When the hospital is evacuated, he stays with her, desperate to keep her alive as the storm rages around them