Look at the other end of the line. There should be an irony somewhere out there.
If they can process plastics into something edible (work as CHON food sintetizers) or that can be metabolized by the ocean ecosystem could be a way to get rid of the Great Pacific garbage patch should be something pretty good.
In the other hand, if those start to pour into our plastic and oil dependant civilization could be pretty damaging.
Suppose that they put 10000 random persons in jail or directly killed, but 20 of them resulted to be killers. That would justify what they did?
They are stripping privacy everyone, not just people from US. And they probably will have false positives, or scapegoats, or just push an agenda using the information they gathered to extort/force someone to act in their interests. And as Snowden proved, even in the improbable case that they as institution had a justice as goal, the individuals working there could had used the information at their reach for their own goals (and the odds of misusing it increases as you get up in the organization)
As i said, the government said that weren't them.... probably. But could had been, after all, reporters or press in general are the ones that receive leaks to announce them.
But odds are high that is just another windows intrusion as there are many, i.e. running a trojan or any new worm, or be a new version of something on the lines of Red October that could take years on be detected.