No problem to agree with that.
I think the world has never been the same after WWII and everything that happened during the "Third Reich".

And, after reading the postings again, sure, there are a few things that reminds me on Hitler and the NAZI`s.
The fight between Dumbledore and Grindelwald was in 1945,
The "Hakenkreuz" (is it really fylfot in english) which is a very old symbol with several different meanings, the Nazis have just taken over.
The Death Eaters - there is no problem to see a reincarnation of SA or any other of Hitlers killing troupes in them.
You can go much deaper. Voldemort is a "Half-Blood", his mother has married a Muggle. So he does not meat the expectations he has to his fellowers.
And Hitler, if you look at the pictures of the ideal german he wanted to create - you will not find anything of him in them.
I think this list is nearly endless.
But JKR did not only give us hints to the Nazis, she also located the story more or less in the present time.
And it is this present time where Harry and the others have to fight against the "evil".