That made sense when naval vessels had huge ensigns hanging off the back of them during the age of sail. Today nobody uses this signal anymore, since it is ambiguous, hard to spot and sometimes impossible to do (try it with a Swiss or Japanese flag!).
Current flag-based distress signals are the signal flags N over C or the day shape of a ball over a square.
My main reason for not outright banning it is in case of a situation where the only people capable of sending a distress signal don’t know the correct way. An upside down flag is one of the better known ways, even if it is deprecated.
Or the union flag, which looks only slightly different when it is upside down. It doesn’t matter though, the original comment was about the US flag.
Ships, then and now, have a whole locker of recognized flags for signalling distress. Flying your national flag upside down has always been a “sure, if that’s all you have, whatever, anything to attract attention ” thing.
Besides, in the Wooden Ships and Iron Men era, the French and Spanish flags didn’t have an upside-down, and the Union Jack isn’t blatantly wrong when reversed.
And other things. I am amused that in the International Code of Signals, the two letter signal SN (Sierra November) means:
“You should stop immediately. Do not scuttle. Do not lower boats. Do not use the wireless. If you disobey I shall open fire on you.”
Most of the U.S. flags I see flying in rural Indiana are left out 24/7 with no lights and are faded and literally raggedy. That’s 3 strikes right there.
Meanwhile, they’re burning yard waste and regular garbage (also against the law), but do they add these damaged flags to the pyre? No, they do not.
Sorry this is so hard to read. The parts to note are “Five crises in search of leadership.” culminating in “Leadership:” “And I want to be the anti-flag-burning president!”