By Barbara Hall, CNN
(CNN) – The early-morning shooting inside a suburban Denver movie theater Friday is now among the deadliest in recent history. Authorities say the suspect, 24-year-old James Eagan Holmes, was studying neuroscience in a Ph.D. program at the University of Colorado School of Medicine.
Retired FBI profiler Jim Clemente says the perpetrators of these types of mass killings are typically disenfranchised young adult males who feel alienated by society. Clemente says their homicidal motives seem to be a product of genes and the environment:
[2:01] "Genetics loads the gun. Your personality and psychology aims it. And your experiences pull the trigger."
Hundreds of people have been killed in mass shootings over the past 30 years. But do these mass shootings represent a disturbing upward trend? Florida State University Criminologist Gary Kleck says no:
[3:19] "It's kind of absurd to talk about trends in events that occur maybe two or three times on average a year. So, there really isn't a particular, stable pattern to the frequency of mass killings."
Former profiler Jim Clemente believes there's very little society can do to put an end to all acts of senseless violence:
[4:01] "The more we are sort of careful with other people's feelings, the more we are sort of inclusive as a society, it's going to help avoid some of these situations. But some of them, I think, are bound to happen anyway just because people are going to fall through the cracks."
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