This is exactly how I started doing my preps. I've always kept plenty of food on hand (we used to only get paid once a month, so had to make sure we had enough food to last, PLUS enough to go another month "just in case".)
When we were stationed in Germany during the "Cold War" years, we were REQUIRED to have an "evacuation" bag (AKA BOB) for each member of the family, packed and ready to go at a moments notice. THey also did annual drills where we had to pretend we were evacuating, go to the assembly point, and they checked our paperwork and bags, and told us about anny "deficiencies" that needed to be addressed.
We now live in an area that is subject to frequent weather-related power outages, as well as having a history of less frequent (about once every 35-40 years) but catastrophic floods. (I made sure we bought a house up on a mountain well OUT of the flood plain!) Also, winter weather has shut down the highways for days at a time, disrupting the supply chain.
I justified my preps by using the above situation to be able to "weather the storm". (OK, so the storm could last a year or more...). Although my husband HAS teased me about my stash in the past, he certainly finds it convenient that we always have everything we need "on hand" and don't have to make "emergency" runs to the store, or do without something when the store runs out of an item and takes 2 months before they can restock it because the warehouse/distribution center ran out, as well.