It is possible that this kind of activity from European countries is in fact a direct result of similar activity by the US government.
I digress. I think ultimately you have to decide to accept current practises as inevitable, or malleable.
I for one, do not think allies should spy on each other. Being caught so would have punitive repercussions such as increases in trade rates. If perpetrator makes a big deal about it, then find better allies, and then they can spy all they want.