I think effectiveness is open for debate as well. Consider the recent HN submission [1]. Without any information being released, we do not know if there was a c

I think effectiveness is open for debate as well. Consider the recent HN submission [1]. Without any information being released, we do not know if there was a credible threat, or if the NSA is simply delusional. [1] https://news.ycombinator.com/item?id=6184984 https://news.ycombinator.com/item?id=6184984