Read the analogy I gave about the bank robber.  I don't know how to explain it any better than that. Ordering that the perps erase the illegally obtained data didn't "destroy evidence" of their wrong doing.  I keep telling people that the evidence of wrongdoing was already collected by Rogers by that point and wasn't going anywhere.  She was simply denying the perps the ability to further abuse innocent Americans, which is a good thing. Again, what she ordered to be done had no bearing on the retention of evidence of wrongdoing that had already been documented ad nauseum by Rogers at that point. Why some people can't grasp such a simple concept, I don't understand.