The main motives for a serial killer are sex(whether the act of sex may or may not take place), power, manipulation, domination and control.   These motives drive them to kill, and when they do kill they do it using the sub-motives(see below).  The motives are not justified and do not leave the killer with anything except for his own gruesome satisfaction(which will probably have not been fulfilled anyway, so he will kill again).  The main motives may not sound like real motives but these serial killers are starved of them throughout their life and act upon the main motives in a murder to achieve something they've never had.

Sub Motives : These are the sub-motives a serial killer might display(some killers display various motives).



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Modus Operandi - Serial Killers