By "kind of understand", I think "don't understand" is most common. Knowledge that the "parachute"/"bailout" is refinancing as opposed to assuming the debts doesn't seem to be widely spread.
Likewise the German opposition to default is not widely examined: weak German banks, esp. the Landesbanken, are heavily exposed to peripheral Euro debt (who was better placed to offer loans for those shiny German exports?), and the farce that was the stress tests would quickly be exposed if there were defaults in Greece, Ireland, let alone Spain.
Why was the Germany finance ministry to openness about the stress tests.
The problem is a hangover from a slack money culture that existed before the crash, and slack money requires more than feckless borrowers, it also requires irresponsible lenders. There may be a morality tale in here somewhere, but it's not the simple good country bad country one from the Bild.