Who else knew about KAOS? It seems that there were a lot of existential threats to civilization and always have been. Other enemies of civilization that I recall offhand:
Boskone, The Mad Dogs of IMT, Vegans, Mordor, Draka, Kzin, Klingons, Romulans, Kardashians, SMERSH, Elves, orcs, bureaucrats, Big Tobacco, Bugs, Muslims since forever, Pirates, Moriarity, Mongol hordes, Styphon, Stobor, Melconians and Berserkers.
There's a few others. We have our eye on them.