With enough libertarian-supported inaction, we would have been faced with two very unappetizing choices: accede to the demands of a Soviet superstate that controlled Europe, Asia, and Africa, with the eventual destruction of the United States as a free and sovereign republic; or we would eventually reject the libertarian argument and become a full-fledged garrison state, with the eventual destruction of the United States as a free republic.
The US helped Soviet Expansion after WWII.
Furthermore, we helped them to continue. I remember vividly our exports of Wheat which helped to prop up the failing government way back in the 70's.