For all the sublimity of art, physics, music, mathematics, and other manifestations of human genius, everything depends on the mundane, frustrating, often debased vocation known as politics (and its most exacting subspecialty - statecraft). Because if we don't get politics right, everything else risks extinction.
Doves oppose war on the grounds that the risks exceed the gains. War with Iraq could be very costly, possibly degenerating into urban warfare.
I happen to believe that the preemption school is correct, that the risks of allowing Saddam Hussein to acquire his weapons will only grow with time.