Any other country in the EZ who feels like they can't compete with German prices in Euros are free to leave or to have not joined in the first place. If they want to end austerity, why don't they just leave?
Oh yeah, because they want to have their cake and eat it too. They want other members to pay for the promises their government made.
You are right that there's a decent argument that the Euro never should have been created in this form to begin with. It was a bad idea, and lots of people at the time said so.
This isn't an 'us vs. them' argument, this is showing us that we need to recognize policy failure when it's staring us in the face. EU members probably have two choices long term: much closer fiscal integration (which is members paying for others' mistakes just like we do in the US), or an eventual breakup of the Euro.
From an economics perspective there is no defending Germany's trade position here. It's bad news, and we should be comfortable with calling them out on it.