Defining Thrillers

Thrillers are generally about the battle for justice. A defining characteristic about them is that here is normally a downside to the finish of the storyline.You can often define them by the point of view they are set in :-
Detective story - The characters solving the crime.
Caper - The characters sustaining the crime.
Film Noir - The strong characters point of view.
Pyschodrama - the view of a psycotherapist.
Court Room Drama - Prosecuters/Lawyers.
Each main character of these types of drama can have both main and lesser roles and a mirror. For example in Se7en Brad Pitt, being major role, and his wife, a minor role and the opposites Kevin Spacey, opposite to Brad Pitt in Se7en.