Used to be that military actions took place at the nation vs. nation level and the individual citizens were just along for the ride (whether they wanted to be or not). So, one country would spy on another COUNTRY, intercept the other country's communications, etc. Other than stuff that was military related, commercial and private communications weren't really of interest to national intelligence.
Fast forward to now and you have private citizens taking violent action against countries they disagree with. As 9/11 demonstrated, this sort of action can result in mass casualties and huge material losses. Like it or not, governments have good reason for snooping on the communications of individuals.
I still don't like it. By my reading of the 4th Amendment, the NSA is not allowed to listen in on my (or any other U.S. citizen's) communications. Unfortunately, about all I can do about it is threaten to hold my breath, stomp my feet or, now, appeal to the UN. Appealing to the UN probably won't do any more than my other "threats.".