No time to do it here, but I can make the case that the military all out war on Communism should have commenced no later than 1945 (even earlier would have been better) and been completed by 1950. If anything, we did not do enough. Even after the events of 1989 - 1991, Communism still festers.
I once suggested something of that sort to my father, a regular Army officer who served in the 7th Army from North Africa to the end of the war. I'm afraid your idea appeals to young arm chair theorists rather than the men who fought the war. They were tired, their equipment was tired, and they all were being prepared for a massive invasion of the Japanese home islands. To suggest an all out attack on Russia would have probably resulted in mutiny on a grand scale. Not to mention the problem with logisitics, supply lines, weather, and other mundane but important problems.