There is no punishment on this earth that is enough for someone who abuses animals and children. And not necessarily in that order.
Generally being described as possessing IQs in the "bright normal" range,[6][19] although they are more likely to have low/average intelligence.[19] A sample of 174 IQs of serial killers had a median IQ of 93. Only serial killers who used bombs had an average IQ above the population mean.[20] Often, they have trouble staying employed and tend to work in menial jobs. The FBI, however, states, "Serial murderers often seem normal; have families and/or a steady job."[13] Other sources state they often come from unstable families.[6]
They were often abused—emotionally, physically and/or sexually—by a family member.[6]
Fetishism, partialism, and necrophilia, are paraphilias which involve a strong tendency to experience the object of erotic interest almost as if it were a physical representation of the symbolized body. Individuals engage in paraphilias which are organized along a continuum; participating in varying levels of fantasy perhaps by focusing on body parts (partialism), symbolic objects which serve as physical extensions of the body (fetishism), or the anatomical physicality of the human body; specifically regarding its inner parts and sexual organs (one example being necrophilia).[21] A disproportionate number exhibit one, two, or all three of the Macdonald triad (see below) of predictors of psychopathy:
Many are fascinated with fire setting.[6]
They are involved in sadistic activity; especially in children who have not reached sexual maturity, this activity may take the form of torturing animals…"[6]
~source: Wikipedia
Amen.