@Setanta,
Undoubtedly a lot more of Americans would have died, but it's by no means certain that it would have been "needlessly"
Clearly if a US attempt to put the Soviets down was unsuccessful the American who died in the effort would have done so needlessly, but I tend to agree with Patton, that if we had moved on them post WWII we would have neutered them.
Approx 34,000 young Americans died in Korea and about 50,000 died in Vietnam.
There's no certainty that a neutered Russia would have prevented Korea or Vietnam. but it's a reasonable assumption that it would have.
Without a Soviet Union engaged in a World War with us there might very possibly have been less dead Cambodians, Laotians, Angolans, Afghanis et al
Not American lives of course but worth something.
Obviously this sort of "what if" conjecture can't be settled with certainty, but it's interesting.