The ghost's domain is forcing him to play, yes I am kinda using the JJK nomenclature here, but not exactly.
Just look at his expression when he notices that he is starting to play.
The idea of an area where an entity has "authority" over those inside isn't anything new, the ghost has something to do with gambling, pachinko serving as a specific "theme", and with how big that game is in Japan and how gambling must be a very powerful "topic" to concentrate energy, this ghost must be very powerful, more so if it can influence Makube like that.
Kisaki is just trying to justify his actions, he is lumping every single person that is "classified" as a uni student in the same banner of behavior because deep down he knows what he is doing is wrong, but he needs a "good" justification to allow him to massacre more than a thousand to achieve his desire.