The "misery" of the southern countries is merely one of not being able to spend profligate amounts they haven't earned on sustaining unaffordable social policies.
To take the most extreme example, Greece, and some problems evident when they hit the buffers a few years ago.
Hairdressing and playing the trombone are/were considered dangerous professions by the government, because that allowed people to retire at 50. The pensions in question are vast and the state cannot afford it.
Public sector wages rose 50 percent between 1999 and 2007.
Tax evasion was rampant.
Salaries were very high, industry near none existent. Its books were fraudulent - the country was only able to join the euro at all because it misrepresented the state of the economy.
Attempts to fix these problems triggered riots and political chaos, much of which had explicitly anti German rhetoric. The Germans, you see, were being totally evil by not shovelling all their savings into this money furnace disguised as a developed country.
What about Spain?
Home of the famous airport to nowhere: https://psmag.com/economics/airport-to-nowhere-spains-costly...
And a giant housing bubble: https://en.wikipedia.org/wiki/Spanish_property_bubble
Has a large (>2% GDP) government deficit but raised the minimum wage by 22% last year.
Germany isn't inflicting misery on southern countries, they inflict it on themselves, and it should by all rights be dramatically worse - and if it weren't for Germans sending them such huge wealth tranfers it would be much worse.