Church of Isekai -2

A school-trip ends up at a strange destination. Humans get transformed into fantastic characters but instead of enjoying Magic, the deeply-seated vices burst forward. What's more important - building a new society free from the past or taking vengeance for many years of mistreatment by classmates? Someone chooses the later and manipulates all of the new arrivals into living in constant fear and loathing while the former victim of peer abuse now pulls the strings. The Hero manages to take over the moraly-crippled Camp but only by limiting their freedom of choice. It seem to be working - neighboring Worlds aren't sending the new Monsters... YET. The Overseer World seems impressed but they'll want to stir things up eventually.

The hero read that infinite rule even by the well-intended rulers doesn't end well. Where is the Balance between a Well-Meaning personality and the System that is based on the largest number of participants?

Need to think fast and always be right.