@suzied
The argument is is that countries like Germany with a strong manufacturing base and economy need weaker countries for their own export base. After WW2, America needed a strong Europe, so that it could trade with us. It's the same story now with the the stronger countries in Europe.
The UK's problem is that, unlike Germany, we have a balance of trade deficit. We don't export enough and we struggle because our wages are relatively high and we are inefficient, so our goods are expensive. That's why Thatcher had a vision that we should turn to financial services and people who worked in traditional manufacturing have been 'left behind'.
Germany doesn't support weaker economies, because it's altruistic, but because it's in Germany's best interest to have countries which can afford its goods. Incidentally, that's partly why we spend on overseas aid.