Terrorism will always be here, as i said before : As long as there are people with mental problems, payback desire and a death wish theres always gonna be terrorism.
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You had better want more done than you suggest. In an age of nuclear weapons portable in the trunks of cars, these people can do a horrific amount of damage to western civilization. The attacks on 9/11 were pinsalamanders compared to what would happen if a nuclear device were detonated in Manhatten, London, Hamburg, Moscow, Singapore.....