Violence continues because most Iraqis are ill educated and want to have something to feel good about...power over their neighbor, a gun, blaming their own poverty and ignorance on America because that's what Saddam taught them. A Jazeera fans the flames, funded by area evil axis tyrants, who also train and send in 'insurgent terrorists' to commit mass mayhem and murder. Iraqis have an emotional age of maybe ten or eleven. They want instant gratification and somebody needs to pay in blood and pain for what they've done to their own country, for what Arabs have done to themselves since the ninth century. See excellent earlier reply to a post today...A Winston Churchill quote concerning the nature of Arabs. Maybe someone will recall who posted it. Right on the money. Arabs haven't changed a bit in all these years except for possibly growing more venal.
You can't stop everything, but you can easily stop someone blowing up a car-bomb and killing and wounding scores at a time.
Why does this continue to occur.
Because we're being to damned NICE! There is nothing P.C. about war, especially when it is against terrorists!