It's sort of like asking what's the harm of violating the humans rights of innocent people. If you have to ask the question then you need to look at your value system.
It's nothing of the sort. If the stated purpose is the electronic surveillance of al Qaeda operatives what is the consequence of getting that wrong (as in intruding on an innocent conversation)?
If you have to ask the question then you need to look at your value system.
Certainly you have more confidence in your position than to resort to this, don't you?