An arsonist is someone who likes to start fires. There is usually some kind of a pathological element towards this act, and it feeds a psychological need on the part of the person committing arson. Or, as another might say, "Some people just want to watch the world burn". A person who studies the effects of acts of arson are called arson investigators, and are usually associated with local fire departments. Arsonists crop up most often in television programs of the crime drama and police procedural genres.
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