Why should Germany write of the Greek debt if the Greeks are not willing to change their ways? Thats freaken ludicrous. And don't be fooled.. The Greek aren't about to go through what England went through with Maragret Thatcher. The Greeks seem to have a false sense of entitlement that needs to change first before they could ever hope to make that country sustainable again. I don't forsee that happening soon, do you?
Maybe Germany is better leaving the EU and going it alone again and saying to hell with everyone.
My first answer to you is a practical one. The Germans and the other EU counties are going to loose the money loaned to Greece anyway. So a write down is the correct approach. Not that Greece should be off the hook. You are correct in a lot of what you say.
However this whole problem is amplified because of severe structural problems in the EU. For one thing there is no Federal tax or budget, just assessments for things like agricultural subsidies (which the French love and the UK hates) and paying enormous fees to officials. For instance the unelected Claude Junker is paid more than Obama.
The last higher than expected assessment to the UK caused a big row.
The other issue is that the EU has no bankruptcy laws. In fact the legal system is strange. Any financial case in the EU can be litigated in a country of choice. Most often chosen to try cases is the UK. This is because British justice is thought to be fair and not bent, like it so often is in continental Europe. My nephew's father in law is a QC who has made an enormous fortune litigating these cases. He demands $1.5 million to open a file. My niece is a young barister making a name for herself in this area and doing very well.
If a US state got into the kind of trouble Greece is in, it would be handled like the Detroit bankruptcy. The EU has nothing similar. What Greece really needs is a bankruptcy mechanism but there isn't one just endless fudging and chaos.
There are a lot of people in Germany who would like to leave the Euro, and the EU, but not the numbers in the UK for EU exit. The UK is still on Sterling and never joined the Euro project.
A recent well conducted study showed that the average UK household would be better off by $1600 a year by Britain leaving the EU.
The Eurozone countries have economically performed far worse than the non Eurozone countries, especially the UK. The fact that the Euro is a crude currency peg, is putting the Eurozone at constant risk of the deflationary trap. That especially applies to France.