There had already been books and movies with that theme, you can take it to the bank that hi-jacked airliners as an improvised WMD were on the radar at the relevant institutions.
The problem was that even if the information was available to them they didn't act on it timely.
9/11 happened because they let it happen
Jets would come at you if you flew over cities without permissions
Why do we encrypt things in the first place? because lack of trust
Maybe let's fix that instead of expecting society should lack "trust" between actors