Keep in mind I haven't read the current Eternals run yet that seems to be pretty good by the way. But from what I have gathered it's more the other way around. Druig is now the leader of the Eternals and he is pushing the narrative that mutants should be considered "excess deviation". In that case the Eternals would be forced to fight since it's in their programming to do so.
The point of contention for all of this seems to be around the controversial topic of mutant resurrection. By making death meaningless they are changing the natural order of things. A closely guarded secret that will apparently be revealed to the world as part of the event.