A lot of Americans do seem to romanticize 9/11 like this, and will claim that anyone who dares to question what happened then in NYC/N.VA/DC/PA is "insane", "silly", "ridiculous", "an insult to Americans", "9/11 victims/their families", etc.

Yes it was horrible and it's a tragedy; but a lot more innocent civilians in other countries we are at war or "conflict" with have died, lots of people who were in Manhattan that day or the next six months died of cancer or respiratory issues related to the demolition of the buildings that were designed to withstand a plane crashing into them, and I don't see you getting angry about that.

A lot of military personnel from the United States have died too but they know the risk for death is always there, and have signed up for it.