The Chronicoms have stated that they are meant only to observe, with the sole exception being when humanity is threatened with “an extinction-level event.” This apparently need not be an event that actually renders humans extinct, as we see from the event in question.
Obviously, this explains why they didn’t care much about Hydra, or Aida, or Hela, or Kilgrave, or whoever, or with the internal conflicts of Inhumans, S.H.I.E.L.D., or indeed any regular human organizations.
But why, then, did they not interfere when:
- The Chitauri invaded Earth?
- Hive sought to turn all humans into Inhumans and make them extensions of itself?
Dormammu tried to consume the planet?
Ultron tried to drop a city on the planet?
Were they unaware? Unable? Did these not meet their criteria? Did they try and fail?