What you're seeing here is a policy that came into full flower in World War II but has been a part of radio since the beginning. It's the idea that all paths must be pursued to maintain absolute mastery of signals intelligence on communications channels used by the public. It's as full an example of imperial military doctrine as you will encounter anywhere. This unfortunately puts the military interests of the United States directly against the civil rights of United States Citizens.

Oh yeah, also. It's pretty settled case law that your first amendment rights do not apply to broadcast radio signals.