Let's unpack it.
First, Germany is not Red China. It is a parliamentary democracy.
Second, Germany is not choosing or trying to choose any other country's government. What Germany is saying is very simple: "We play by the rules and because we play by the rules the euro is stable. The other euro countries have been ignoring the rules and depending on us to carry them. Sorry guys, but now it's time for the slackers to step up and do what they promised they would do, or we're not going to be your suckers anymore."
Third, the relationship between Germany and Spain is far different than that between the US and Red China. Germany and Spain are allies and they share a common currency and Spain has been exploiting Germany's friendship and goodwill.
Red China and the US are not allies and do not share a common currency and it is Red China and not the US that has exploited the good will of the other party.
Your analogy is as wrong as analogy could conceivably be.
You don’t find it odd that each loan has been preceded by rate spikes and government collapse, which each replacement government has been German friendly technocrats? Just because they are “allies”, it is ok? David Cameron should pick our government? The people should have no say?