As an American, I love 9/11 jokes.
Just as much as I love jokes about any other awful shit that happens in the rest of the world.
It'd be unfair of me to laugh at the Titanic, Hiroshima, and the Anders Breivik massacre but be disgusted by World Trade Center jokes.

Mom barely survived and aunt died in 9/11, yet I still laugh at jokes and don't get buttsad like the typical faggatoni who wasn't even affected by the incident in any way.

If nobody cared, this wouldn't be an effective means of thumb whoring.