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The Stanford prison experiment suggests that you don't need that much to get people to do immoral things. ISIS evolved over years of hard civil war.
ISIS also partly has their present power because the US first destabilised Iraq and later allowed funding of Syrian rebels. The US was very free to avoid fighting the Iraq war. ISIS fighters get killed if they don't fight their civil war.
The Stanford prison "experiment" was a LARP session that got out of control because the GM actively encouraged the players to be assholes to each other.