They all want to partake in the spying, that's the central issue for countries like Germany. It's the same across all of the 5|9|14 eyes groups of nations. They know exactly what the bargain is that they're accepting. They all know exactly what they're doing. No modern nation is so naive. Nobody else comes close to the global spying capabilities of the US, the other eyes nations all know that and they all want access to it.

Germany has been knowingly helping to make the US global spying capabilities more potent for most of the post WW2 era.

If you're Germany what you do is take whatever limited corrective counter measures that you can and attempt to improve the security of Merkel's communications, while seeking to maintain continued access to the US global spying machine.

If there is an orgy you don't call the police... you find out the address so you can attend as well.

What is the connection to the US here? This article and the GP primarily concern Germany, as far as I'm aware.