Consider this. NSA are the ones who are providing intelligence reports to the different parts of the government. They very likely employ a number of psychologist and sociologists. (I can not verify this, it's just a morbid hunch.)

What is there to prevent them from biasing (or slanting) the intelligence so that they continously keep nudging the perceptions of those reading the reports? The names for this are numerous; thought influence, advertising, even brain washing in extreme cases.

Or in other words - for the NSA, the course of society may well be what they can make the government want.