Do I have to explain basics of international politics for you? You heard of NATO and UN? I know those weren't part of the game before WWII, but even then there were treaties to be honoured.
And obviously you can, and should, invade countries even if they aren't a threat to you nation: Yugoslavia, Rwanda (oops), Libya and Syria are recent examples where actions could have been taken on that account.
Iraq, Vietnam and, maybe, Afghanistan are examples where I believe there wasn't any reason to interfere... But it's my personal political point of view, it's not to derail the OP...
.....and we have a pretty special treaty with the Falklands.
Your argument is unraveling. Now you are saying that we should have intervened in Syria and Libya, yet absolutely not in Afghanistan and Iraq? Hindsight is a wonderful thing.
NATO treatys eh? So when do you think we should start the 3rd world war with Russia?
