A quote from the second half of the article (that was not included in Bostonian's snip)":
"Prof Jan Schnupp, Professor of Neuroscience, University of Oxford, added: "Half the people in your office will carry these genes. Odds are 50/50 that you do. How violent has your day been? To call these alleles "genes for violence" would therefore be a massive exaggeration.
"In combination with many other factors these genes may make it a little harder for you to control violent urges, but they most emphatically do not predetermine you for a life of crime.”"
Or, as I said above - correlation is not causation.
