In another incident, a mother said that cafes and restaurants had refused to warm up baby food for her daughter because the hot food might burn the 14-month-old girl's mouth.
Even the spent fuel that has accumulated over 30 years of use is so radioactive it is hot enough to burn metal containers unless actively cooled 100% of the time.
Convenience is part of this: There's little preparation, it doesn't take long to cook, you can feed a lot of kids in a hurry with a few packages of hot dogs, and the kids usually don't mind if you burn or drop a few.