How so? Also, I wouldn't say they're vast. Anyone who resists is killed. Anyone who submits is sterilized. That is genocide. It still indicates he experienced one of those mental illnesses. So, not exactly the picture of mental health. Though, we're also never told that all of these experiences end. The salient point for me however is that he states that his body moves on its own. Losing his sense of agency, followed by delusions (his reasoning is actually quite specious, but he states that he's able to understand complex philosophical questions with ease), and more... I'm not certain that we know those are other people, but it's irrelevant. He calls himself 'the Master' but presents with multiple personalities. It isn't Bob, Betty, and Borg. He's also rather quick to suicide. I forgot to mention that. *if they don't serve a purpose to him* I'm assuming the sterilized ones are cult members, and anyone he can't mutate he kills.