There are tons of reasons to be concerned about cruelty to animals, the least of which is that cruelty to animals is linked to cruelty to humans.
In addition to a growing sensitivity to the rights of animals, another significant reason for the increased attention to animal cruelty is a mounting body of evidence about the link between such acts and serious crimes of more narrowly human concern, including illegal firearms possession, drug trafficking, [illegal] gambling, spousal and child abuse, rape and homicide. In the world of law enforcement — and in the larger world that our laws were designed to shape — animal-cruelty issues were long considered a peripheral concern and the province of local A.S.P.C.A. and Humane Society organizations; offenses as removed and distinct from the work of enforcing the human penal code as we humans have deemed ourselves to be from animals. But that illusory distinction is rapidly fading. [...]
animal cruelty has long been recognized as a signature pathology of the most serious violent offenders. As a boy, Jeffrey Dahmer impaled the heads of cats and dogs on sticks; Theodore Bundy, implicated in the murders of some three dozen people, told of watching his grandfather torture animals; David Berkowitz, the “Son of Sam,” poisoned his mother’s parakeet.
You can read the rest at New York Times Magazine >>