[Wild Goose]

You mean his only motive - MO in the law enforcement context is the acronym for modus operandi, which is Latin for "What is this guy's preferred method/mode of operation?"

...it's complicated.

Spoiler for Spoilers aheard:

Spoiler for Danger will robinson:

Spoiler for Abandon hope, all ye who enter:

Spoiler for Soylent Green is people:

Spoiler for This is your last chance!:

Spoiler for Alright, here it is, based on the novels:

Even Kayaba has actually forgotten what the hell his intentions were, beyond dreaming of a floating castle in the sky and wanting to make that dream a reality.