For the welfare of the people in Greece the greek government is responsible, not Angela Merkel.
Instead, the common currency has greatly benefited Germany: had the Germans retained the Deutsche Mark, their currency would be valued higher than the Euro is now, making their exports more expensive and/or lowering the profits of export industries.
Greece with its Drachma would have been a welcome victim for currency speculation. This was tried with the Euro, too, but it failed.
People also think in economic terms, but the Euro is a political project. Countries like Greece wanted to be in the Eurozone. It was not Germany's wish. It was the wish of Greece and the population of Greece also wanted it - not just the politicians.
Germany actually did not want to have the Euro itself, it agreed to the Euro to get the Reunification. But it agreed on the Euro to be a stable currency, not one that politicians would devalue to gain short term effects.
All pegs are a potential victim of currency speculation. The solution is to end the peg and let the currency float, as it happened to the British Pound/Deutche Mark during the Soros stunt in the 90s or more recently with the Euro/Swiss Franc peg.
That is correct, but one could ask that people don't go around and say "Germany saved Greece!", cause no .. it didn't. It saved its banks.
Without paying back the money (-> to the banks), Greece would have been bancrupt within days. Thus saving the banks saved Greece from being bancrupt. Without banks and without government money from the outside, nobody would have given Greece any credits...
The currency union was just very badly thought out. A currency union without a fiscal union is probably a bad idea. That was recognized somewhat by the stability criteria for new members that were then swiftly ignored for various reasons.
That's highly debatable and in a changing political landscape there was no future for that. A tiny country next to the EU and a large Eurozone? Greece needed reforms and some (not all) of them were long delayed. That's also the point of the EU and the Eurozone. It provides the framework for the reforms. The largest win for Greece is a stable democracy, after a long phase of political instability and military governments.