- the end of the cold war, with the clear hegemony of the US which halted state-sponsored terrorism from unaligned-but-socialist-minded countries (especially Libya)
- targeted assassination of terrorist leaders and infrastructures (no more training summer camps) no matter the country they are in (mostly through drones nowadays), leading to a progressive reduction in sophistication in terror attacks committed, and the rise of lone wolfs instead of structured terrorist commandos.
(...But logically and intuitively everything I just said is extremely stupid because by that logic 12.01 counts as "dozens" and that's ridiculous, so your complaint is absolutely correct and I agree with you 100%)
I'd argue that "dozens" obviously means there are a multiple of 12.
https://www.smithsonianmag.com/history/a-brief-history-of-ai...
https://en.wikipedia.org/wiki/List_of_aircraft_hijackings#20...