According to the latest Snowden documents, the NSA has implanted software in thousands of computers, enabling the data on those machines to be accessed via radio waves even when they are offline. “There is no evidence that the N.S.A. has implanted its software or used its radio frequency technology inside the United States.” Now you know about the strategy. And so do governments and hackers that may wish you harm. And so do drug cartels and other groups who were possibly being tracked. Are the risks worth the transparency? That’s an increasingly complex question as more Snowden-leaked data gets dumped.