I know that Apple introduced that feature with iOS 7 and the number of robberies of iPhones dropped dramatically thereafter...which was the point of it and a really nice thing to see.
However, this angle on things, which I hadn't thought of, is totally on target - this is totally ripe for abuse by the NSA etc. when the correct number comes up..political or otherwise. Remember we have seen one of these agencies erase information that the Senate was looking at to audit them with, then that agencies leader lies under oath about it - then doesn't get punished in the slightest for it afterwards.
At this point, Joe public wouldn't need to worry about it, but we need to have things set for when stuff gets bad (when the wrong President gets into power and knows how to use all that intelligence offense he has behind a military official whose only oath is to his orders) and things go to a police state for political gain (as it always is)...then this becomes a terrible thing and not worth having.