What you said is true but what about the race to German scientist by Allies and Soviets? The USA maybe wouldn't had landed first to the moon without Von Braun, wouldn't had superior jet aeroplanes without Germans and maybe they wouldn't had the A-bomb in 1945 without Fermi.
Right ! (A part from the jet fighters : Americain reached and overcame the soviet level of quality only when they found that their machines were all inferior to the MiG 15, and worked a lot to improve them during the Corean war.)