That's fine by me. Nation states should be spying on each other. Its within my interests to spy on the French, regardless of whatever bullshit political relationship we have. France is busy building carriers for Putin to oppresses Eastern Europe with, for example. We're not all buddy-buddy in the real world. The only reason those carriers aren't being used to shoot at Ukrainian civilians is because of US pressure to temporarily hold them.

and it's midnight meetings at the Elysée and general outrage all round.

Except this is political theater and face-saving nonsense, just like Merkel's cellphone or the million other things before it. We're still spying on them as we should as its within our interests. They're spying on us, except we don't have a German or French Snowden, or at least not yet. The Five Eyes share intel and spy on each other as well. Being at an information disadvantage is stupid. France, Germany, etc are an election away from assaulting US interests. We have every right to spy on them.

Looks like millennials are starting to learn what Realpolitik means, or are going to once they start to learn how the real world works.