It certainly would be unpleasant, but we warred in Korea, Vietnam, Cambodia and a few minor places against the Communists without those kind of losses or attacks on the continental US. Using foreign lands for battlefields has worked out quite well, not that I like it, but at the time Reagan did the right thing, and prepared in the best way known at the time to prevent overt Communist aggression.
It was the subversive campaign we lost, although Reagan tried very hard to fight it.
You have no grasp of the scale of war that was expected to engulf Europe, America, and the world, if the Soviets attacked.
America was not expected to survive, Western Europe sure wouldn’t have.