You're misunderstanding the situation. That genocide is against an alien species. Many of the people they make disappear are aliens. My point is that ONI takes action against those they view as a threat. So you've got Michael. He's not some basement hacker who breached ONI security to expose government secrets to the populace. He's a UNSC recruit with an ONI father who breached security to show a few other recruits a video, and who wanted to follow in his father's footsteps. That seems like a much more useful (and simple to acquire tool) than a threat