Jared Lee Loughner (Tucson shooter), Anders Behring Breivik (Norway shooter) and James Holmes (Aurora shooter) all have Moon in Virgo.
*UPDATE: So was Wade Michael Page (Sikh Temple shooter):
"You lead a quiet, unpretentious life. You are strong in intellect, and have a very good memory. You should pursue a career of a cerebral nature. You could be quite successful in such a vocation. Occupations dealing with health and healing are also ideally suited for you."
"He has a very good memory. Scientific or medical studies preferred above all others. He is humble and moderate, calm and reserved. Emotional discipline. He is willing to help, devoted and gentle.
Weaknesses: servile nature, frequent changes of occupation, gets annoyed, upset, worries. He is too shy.”