Other than the few that had that "evil eye" thing going on, a great number of those pictures could be of any of our next door neighbor's. That was part of Ted Bundy's success, he looked like any other good looking college guy, well spoken, educated. His victims couldn't have guessed what was in his evil mind.
I'm more interested in the connection between animal cruelty and human cruelty. How many of the those faces were the kids that liked to hurt and kill animals and thought nothing of it. How many of those faces were kids that killed the neighbor's cat, or the family dog, or ducks at the neighborhood pond... then go on to rape, assault, brutalize other people, abuse their spouses, beat their children or become the serial killers of this world. I wish I could see that tendancy for animal cruelty when I looked in their eyes. Think of the crimes that could be prevented if we only knew....
When kids and young adults are arrested and/or convicted of cruelty to animals, their DNA should be added to the National database. Then if they ever graduate to human cruelty then their DNA would instantly identify them. Think of the lives that may be saved if this was possible. Colorado just enacted a bill which allows the collection of DNA from people convicted of animal cruelty. Some recognition of the connection!