My reference to Finland was not as a Polish ally, but rather the Finns found themselves in a similar position when attacked by the Commies in 1940 - they appealed for help from England and France and got absolutely nothing. Oh, Churchill used the idea of helping Finland to help sell his idea to invade Norway at Narvik, but that was as far as any "help" the Finns got.
The Poles got no help from these same 2 "allies" either. That was my point.
As for the post-WWI era, Tom about covered it all, except he missed that in addition to crushing reparations, the Germans also lost the Alsace industrial region to the French, a region that provided considerable wealth to the Germans before WWI.
The German people were starving as the war dragged on. There is a story told about a tram horse dropping dead in the street, and within an hour there was nothing left - the citizens butchered it where it fell and carried off everything for the stew pot.
Whatever the failings of the Jews in Europe - and there were undoubtedly many - it in no way constitutes a "they deserved it" mindset. The Jews have been a European whipping boy since the Medieval Age, and were officially thrown out of most of the countries in Europe at one time or another.
Example: Very few people know that the very day that Columbus left port to explore to the west, August 3, 1492, was also the last official day you could remain in Spain and not be a Catholic. In the 2-300 years prior to this, the Jews were expelled from the various baronies and dukedoms that comprised France and Germany, Austrian, as well as from England.
Hitler had lots of options, but truth is, he simply used them as a continuing scapegoat for all of the problems that came from the abusive punishment of the allies, the incompetence of the Weimar gummint, the subversive meddling of the Commies, and all of the other problems that faced post-war Germany.