I'm not a super big fan of slippery slope arguments either. Then you get people opposing programs not on their own merits, but what might happen if that program

I'm not a super big fan of slippery slope arguments either. Then you get people opposing programs not on their own merits, but what might happen if that program were in the hands of the "other party", and then later in the hands of some dystopian totalitarian state. Either way, I'm not sure why you say open source developers are supplying the NSA with Accumulo. You have it completely the wrong way around; NSA supplied us with Accumulo.