Surely people on HN care more about real facts, right?
But like the parent poster said, some people can only think black and white.
Yes, Hitler and his mad, failed quest for power ruined Germany. I don't know if maybe you've never seen them, but the Bundesarchiv has some pictures which seem pretty starkly clear on that score. And then more or less everyone else in the Northern Hemisphere provided the resources and a lot of the labor to unruin Germany, because everyone still remembered what happened the last time they'd had to deal with a ruined postwar Germany, and after what had come out of it that time, no one wanted to find out what would come out of it this one.
The brokenness of Germany was not Hitler's doing; rather, its brokenness is what gave Hitler his platform.
And I recommend those people ask for a refund from their history teachers, because anyone who tells you history is black-and-white, good-and-evil, is selling you something. Humanity is one long stream of moral ambiguity. Any moral lessons derived from it are done by omitting contradictory evidence. A simple cruise through a Wikipedia article offers plenty of moral ambiguity--and that should be the minimum starting point for considering yourself knowledgeable in a subject.
Even the archtype of evil himself, Hitler, (and likewise Stalin with Russia) still managed to re-vitalize broken countries into industrial titans that we still benefit from today. Russia was literally a pre-industrial society before WW2. And it's interesting how people who believe in rigid good-guys/bad-guys have no problem driving a VW Beetle, or a Mitsubishi--they made the Kamakazi Zeros, by the way. And both companies benefited from slave labor. It's not even hidden knowledge:
http://www.nytimes.com/1996/11/07/world/volkswagen-s-history...
http://www.slate.com/blogs/the_slatest/2015/07/20/mitsubishi...