Yup. 9-11 was just like other moments we've had - we just hadn't experienced one in a while.
OTOH, all of the stuff about this data being removed and that stuff being taken off the net - it's not something I worry about very much. Similar things occur throughout the entire history of America and the world. This will be no different then the 90s or 80s or 70s or 60s und so weiter.
As for Pearl Harbor, yes, we will probably never know.