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Looking like a warrior is irrelevant. This isn't the movies. They are using the same methods Mao used to conquer China and the communists used to conquer Russia and Viet Nam. Infiltrate. Terrorize. Wear down. Get concessions. It's working.
"Warrior" is a soldier willing to fight, to face combat. Lenin managed to bring communism from within against a weakened monarchy, but it took the great army of Russia to overrun Hungary. It is telling that these petty murderers will strap a bomb to their teenage daughters to get money from Saddam...but they don't organize a real fighting force.
There's a real lack of energy to these Arab tyrants. They'll dip into their treasure to hire Filipinos and Palestinians, but it is not part of the Koranic ethos to work very hard.