Evil vs Evil
The plot has two or more "evil" entities, groups, or such competing or fighting against each other. Often with the player on the side of the "lesser" evil, or in case of comedy the "greater" evil.
Alternate name: Evil against Evil
The first video game about Evil vs Evil was released on May 2, 1990.
Also cases of criminals or such fighting criminals, even if the criminals the player is sided with are not That "evil".