The Post office has consistently been a save heaven for drug dealers.
And so on. Those kind of statement is kind of pointless since each are just technology used by criminals and non-criminals alike. I would rather have people praise DHS for succeeding in doing technical heavy investigations, rather than focus on how much a save haven a specific technology is. Otherwise, it just lead demonizing of technology which is never a good thing.
I don't know where to draw the line. I feel when you hear about children being exploited, somehow my own privacy is of little regard in comparison to kids who have adults exploiting them for these kinds of reasons.