Oh, I agree with you.
I worked on aspects of the US PAT act. As such, I became aware of some of capabilities (snowden released more than I knew, but has missed other things; thank god). NSA having them is not a fear to me, BUT, I always thought that they needed a LOT OF OVERSIGHT. Sadly, once the act went through, the GOP pretty much removed CONgressional oversight of the NSA. That was their way of disavowing responsibility for their actions. But, I have no doubt that many terrorists actions were caught. In fact, I suspect that this is one of those, though others claim that it is not likely.
BUT, the idea that ANY of this equipment could be turned over to police, FBI, DEA, etc is just TERRIFYING. Oddly, a number of the GOP have called for just that, which I can not image a worst situation. We would have a true police state (which in many aspects, I think that we can argue that we already are in one).
As to the Dutch sitation, if that data is limited to say another intelligence group and not a local police group, it makes good sense. After all, the goal of groups like NSA and GCHQ is not to go after local citizens, but to find others from outside of the nation that are threats to their nations.