Plus, the assumption that they're only using their surveillance technologies against foreign powers is now known to (often) be a false assumption. So it's not immediately clear which systems are only being used against foreign powers, so one wouldn't even know what might be held back (if one were to take the position that things only affecting espionage against other nations should be kept quiet).
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Exactly. The entire argument rests on the idea that we are certain that the NSA is trustworthy and is using its powers judiciously against, not only foreign powers, but those that pose a security risk. That assertion is exactly what is in question (for good reason).
I think some people see the NSA as fundamentally good and trustworthy, but perhaps exercising a little bad judgment and/or overreach. Others see their breach of trust as reason for grave concern and a flagrant abuse of power that merits our consideration that it may be the tip of an iceberg inadvertently revealed by a rogue agency.
Where people fall on that continuum probably drives their responses to subsequent revelations more than anything.
US allies see this as industrial espionage not overreach