In the absence of a perfect system of governance I feel we should default to not giving unspeakable power to a concentrated few. The slides on the tools were leaked out of a for-profit firm that contracts for the NSA, next the tools themselves like music industry cohort MediaDefender[0] had happen to them? Or even worse a leak of a database the tools sift through like the Assad regime's BlueCoat[1] logs on political/sexual/religious targets?
Another US firm Palantir was itself tangled in a scheme Glenn Greenwald reported pre-Snowden regarding the targeting of political activists via a solicitation of work through Hunton & Williams made by the US Chamber of Commerce[2]. I can't trust the US intel community as far as I can toss it when conflicts of interest are apparent at every level of clearance given to contractors. So I will probably frown upon most alphabet boys exploitation of capabilities.
[0] http://thepiratebay.se/torrent/3819529/Mediadefender_-_ANTI_...