Extremist thinking does not improve the likelihood of your children's survival.
> Imagine a game of Russian Roulette with one bullet in a gigantic chamber (N slots) where you get to win a small prize every time the gun doesn't fire. Is there any sense in asking if there is a N large enough to make you consider playing this game consistently for 2-3 years, when the gun is pointed at your kids?
You do this all the time when you take your kids for a drive, on a plane, outside, when you feed them, etc. Hell in your supermarket example, someone inside the store could just kill them there after you dropped them off.