It's a political symbol that almost helped us loose the cold war. Now a cross would have been a perfect symbol for peace but they had to ruin the whole thing by sticking a political symbol in the middle.
Wow. Political symbols almost 'helped' us lose the cold war? Putting a bit much into a symbol aren't you? BTW, it started as a symbol for nuclear disarmament in the 1950s (that is unless you believe the kookier sites about Nero's Cross and Celtic symbols for death). And we have a problem with nuclear disarmament why again? What about those treaties signed by great men like Nixon and Reagan?