I can understand feeling morally opposed to it, but a realist might tell you that it's important to spy on the German government simply because it's a powerful actor, even if it's an ally of the United States.
That realist would be a fool who takes the exasperated statements of politicians at face-value. Were any long term trade agreements threatened? Embargoed in a way where they actually did it, not just talked about it? Was military cooperation withdrawn, diplomatic ties severed?
Absolutely none of this happened. A lot of words happened. Mysteriously, for exactly as long as Snowden was in the news right up till Russia invaded the Ukraine.