Of course it's easy to say "It's their own fault, let them stew in their misery", but that doesn't enhance stability.
The EU isn't about making everybody rich, but it is about preventing poverty to such a degree that people en masse would start to panic vote for the first strongman who promises to fix everything.
If your solution is the same as the anti-EU politicians from a country ("We should revert to sovereign currency so we can print our way to wealth") it's likely not the best solution for the long term interest of the bloc.
Neither does having a country have their economy fail every few years.
The Euro benefits the 1%, but not the "common" (i.e. actually working) population.
That's an American slogan and approach, and maybe with their policies of wealth distribution, it's a legitimate target. In Europe the resentment against the very rich is usually reserved for those who dodge taxes.
> the "common" (i.e. actually working) population.
The common, actually working, population usually has pension build up and savings. Try asking those people who formerly had highly volatile currencies how they feel about having those in Euro.
Government money is being redirected to a) prevent revolts (social security) b) sustain the privileges of the civil servant class c) prop up the stock market and house prices for the wealthy.
The Euro facilitates this; giving public funds to country X so that part of it is spent back in Germany (prop up the stock market) is just one gambit of stealing money from the common population.
The working population in Germany does NOT have secure pensions in general. Please look up "Altersarmut" (old age poverty).
And the D-Mark wasn't volatile...
Swing and a miss.