Board Thread:Questions and Answers/@comment-200.246.78.2-20151112141755/@comment-8695373-20151113093037

1) Library Mode states that "The purpose of their existence is the 'continuance of the world,' and they have no regard for the will of humans". I guess that explains the timeloops. And they were created to manage the Boundary instead of Amaterasu, that's why they want to destroy the Master Unit, so it wouldn't stand in their way.

2) The System controlled him, and as we see with Nine's example, Terumi hates to be controlled. He was already Observed by Izanami at that point, so it didn't hurt him to get rid of the AIs. Phantom's virus gave Izanami control over the System, so she could use interventions, and antagonists could summon Master Unit, according to their plan.