Should the U.S. spy agency (one of them, anyway) stop spying?
No
Should the U.S. disband its spy agencies?
No
Is there a role for "spying" in this age?
Absolutely
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The questions are: "Should a U.S. spy agency be allowed to violate our constitution?"
No
"Should a US Spy agency destroy the future competitive nature of US internet companies abroad to save a few lives via stopped terrorist attacks?"
Probably not, but the implications of such a discussion are extremely complex and definitely not black and white.
"If this technology was preventing terrorist attacks, how do we replace it with something less invasive which follows the constitution?"
I have no idea.
The reality is, for those of us on HN who are American Citizens, we probably benefit from our nation having global power. For those who are not American citizens, it is almost definite that you do not benefit from the US government from having global power.
How the US exercises its power could potentially lead to negative butterfly effects. I don't agree with the NSA spy program, but I also have no idea how to stop people from coming here and causing terrorist attacks.
Those that say we can stop them via being nice to other countries have no way of truly knowing that, and those that say we can stop them with the NSA spy program are just as clueless.