Cooper had for years harboured a seething resentment over what he perceived as the growing threat to Britain's civil liberties.
The increase in surveillance cameras, anti-terrorist measures and "overbearing" Government control were a constant source of frustration. He had campaigned peacefully against identity cards and the treatment of anti-nuclear protesters, but it was getting him nowhere.
The catalyst for his change in tactics came in 2003 following the decision to hold on record the DNA of his father, Clive, despite his being cleared of an allegation of assault.
Cooper, a confused young man who had difficulty forming social relationships, suddenly had a cause to channel his anger.
The hate rhetoric of the Left, the seething over its impotence in changing security and defense policy, is more than the expression of inchoate rage. It's the seedbed for this type of domestic terrorism. Watch for the "Kos Kidz," the readers of The Daily Kos blogsite, to start falling into this practice in the not-distant future.