"Wisconsin Killer Fed and Was Fueled by Hate-Driven Music"
From the New York Times, Erica Goode and Serge F. Kovaleski (an old bar customer of mine, actually, going back a ways.)  August 6, 2012

Analysts for the F.B.I. and the Department of Homeland Security routinely monitor violent extremist Web sites of all kinds, including those attracting white supremacists, according to former officials of both agencies. But the department’s work on the topic has been criticized. In 2009, conservatives in Congress strongly objected to a department report titled “Rightwing Extremism,” which speculated that the recession and the election of a black president could increase the threat from white supremacists.

Amidst the horror, the deep sadness for Sikhs, gentlest amongst gentle people, this telling observation about political behavior.  Namely, conservative behavior.  The strong objection, to what has already been shown, as in the Oklahoma City Bombing.  The strong objection, yes, because this is their own tactic, their own worst fault, which they must dress with guilded lilies, the Flag, Patriotism, Anti-Obama.  That's what they do.  That's the playbook standard, the modus operandi.  Which is why they can't stand even the slightest suggestion saying so.

Further reporting in the Times brings out, perhaps, a deeper point, centered on supremacist groups using this kind of music (adopted by the gunman) to spread hatred and recruit new members.  And this, unfortunately, is an element in certain kinds of music, that it puts voices insides our heads, that it promotes the Ego and egotistical thinking.

And this is, as well, a larger problem with mass media culture, in that it is a place for those who are enchanted with their own egos and egotistical minds to present material that promotes the egotistical, that draws the attraction of other egos, thus perpetuating.  In the same, it would not occur to one in control of her own ego to go on a tour of self-promotion and exaggerations.