Great news that the Milwaukee prosecutors seem to have snared Walker, BUT

[Jackpine Radical]

10. The easiest answer from a psychological perspective

is that psychopaths don't give any consideration to potential negative consequences.

In one classic study, people were told they would get an electric shock at a specific time, and watched a clock as the moment of the shock approached. Normals showed increasing psychophysiological agitation (increased electrodermal response, heart rate accelerated, muscle tension increased, breathing became more rapid & shallow) as the moment approached. The psychopaths (as measured by Hare's original Pscyhopathy Checklist) showed none of these signs. On the second and subsequent trials, the normals escalated on all the physiological measures, and the psychopaths continued to remain calm even after previous experience had proved to them that the shock was really coming.

Numerous subsequent studies have showed that psychopaths will increase the strength of rewarded behaviors, but will not learn to inhibit punished behaviors.