Of cause "not"

If people confuse historical responsibility of a nation state with their own personal responsibility then that is exactly the kind of dangerous nationalism that leads societies straight back into fascism.

Of cause just learn from what nationalism done to it

Holy shit dude. No! Absolutely not. Germany today is the result of its history and that needs to be a part of and discussion involving it.

.. like the country you're born in?

maybe they reject it because they weren't personally responsible for that stain. Not saying the stain doesn't exist, but don't you feel it's kind of unfair to be born German if you have this Erbsünde and thus aren't allowed to...

They identify with being German enough to reject that stain on their identity. It's something I've seen in people for all my life.