Sir
It isn't rocket science.
1. If the law allowed the NSA to spy on US citizens, then they don't need to protest.
2. If the law doesn't allow the NSA to spy on Citizens, and the NSA want to, they need to try and get the law changed so they can.
I suspect they can't get this authority passed into law as US citizens might not like it.
Knowingly subverting the law to enable the NSA to spy on US citizens is nothing less than treason against the state (which is run by US Citizens) and the entire organisation should be scrapped and started again with a lot more oversight.
Any statements from politicians that they are exempt from being included is bullshit - they weren't always in that position of privilege (i.e. private law) therefore NSA has something on them all.
The biggest hurdle people have to overcome is the access to good quality information upon which to base their opinions. A free (as in not owned by special interest groups) press is essential to liberty. Without it we have very little access to credible information.