It’s great to learn which is which, but humanity now needs to learn that the beasts have been here longer than us and are here to stay.
Had Dr. Ishiro Serizawa not sacrificed his life to revive Godzilla so that the reptile could defeat his arch-nemesis once and for all, Earth would be destroyed.
So as Thomas Middleditch’s character, Sam Coleman, mentioned early in the movie, there are some Titans that are here to help us, and some that are here to threatens us.