How about these cases?
https://en.wikipedia.org/wiki/Cyberwarfare_in_the_United_Sta...
And this list doesn't even include us tapping the German prime minister's phone line. Imagine our reaction if another nation tapped our president's phone line... Absolute double-standard.
I think both sides agree that security is tantamount. However, the disagreement is on whether the solution to cyberwarfare is being more offensive capability or more defensive capability.