<<Perhaps you should study the Italian Front a bit more. Also, the Eastern Front. WWI was not just in Western Europe.>>
Good point. Last time I looked, Italy was an Axis Power and a belligerent - - it had invaded France and sent troops to participate in Hitler's invasion of Russia, two of our biggest Allies. It was invaded in due course, the Mussolini government fell and was replaced by the Badoglio government - - hardly an imposition of the invading Allied armies. The Badoglio government allied itself with the Allies and the Italian people themselves - - not any invasion army - - captured and took care of Mussolini on their own terms.
On the Eastern Front, pretty much the same story - - the U.S.S.R. was invaded by the Axis Powers and fought back, not only pushing them out of its own territory but following them into theirs. Members of the Axis, such as Romania, Bulgaria, Hungary, Croatia and Slovakia had to deal with an invasion and regime change, but it was an invasion provoked by their own aggression against the U.S.S.R. Poland might have been an exception - - the Red Army supported the Lublin (Polish communist) government, rather than the "London" government (anti-communist Poles in exile in London.)
I think in both cases the invasion of the Axis Powers and the forcible regime changes that followed were amply justified by the original aggression to say nothing of the horrendous atrocities that accompanied it. I must have missed that part of the Iraqi story where Iraq invaded America and committed horrific atrocities against American citizens prior to Bush's invasion.