> 911 became a holiday in some regions.

Name one country that made September 11 a public holiday.

A lot of "celebrated misfortune" is a byproduct of arrogance and the pretense that the US is "smarter" (witness how often the US likes to play "world police"... and how often it correlates to US self-interest. There's nothing wrong with self-interest, but no-one's buying some noble "world police" bullshit when it only seems to happen when the US has something to gain). Certainly not limited to, but also certainly amplified hugely by the present administration.