Americans. There was no excuse for the attack on 9/11.
But, if you think that someone just woke up one morning, and decided, for no good reason, to mount the attack....well, that would be naïve.
It's fun to **** down their neck for decades, but don't act all outraged if they jump up one day, and bite you in the ass.
Because that's precisely what happened on 9/11.