: She's going to try and bring peace. Disbanding militaries doesn't take away a
: soldier's training. Disabling high-level tech only makes people resort to
: more primitive weapons. There will always be some kind of conflict as long
: as two people live. The only way to maintain a peace is to micromanage
: every aspect of someone's life, essentially robbing them of free will.

: Really, it's only a matter of time before she decides it's best to just kill
: everyone to get peace.

I think to some degree she understands that, and she's willing to wipe out the soldiers to do it.

She clearly doubted she could get Chief to her side, and it's not that surprising; he's a weapon of war. She's willing to keep him out of it for the thousands of years she sees necessary for her goals.