I see carrying a backup as similar to wearing a 5 point seatbelt.
Or having a back up fire extinguisher in the kitchen.
While it does technically eliminate some extra risk (and might be a good idea for people who have above average risk factors), it's a bit more than the vast majority of people need.
I'm not going to judge people that feel the need to do any of those things, but it's not for me.
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