i reckon you can tell your friends whatever you want - irrationality is at the heart of history, and you'd be proud to play your part i'll warrant - in your case, i'm not certain how eastern europe was ever america's to "sell" nor how we could have imposed our will upon marshall stalin even had we been seriously inclined to do so
perhaps we're straying from the original point? was it that irrational to, after 9/11, provide military support to the afghan northern alliance to evict the (unjust, as you say) governmetn of afghanistan, which had knowingly like OBL do his thing there? seems hard to argue against, but any military force, however nobly wielded, kills innocents.