Let's give MD4BUSH a chance to defend himself before we jump to any conclusions about who he is. He very well may have posted the full exchange in order to make sure it was available here when the WaPo selectively quoted from it. (As I'm writing this, MD4BUSH's account has been suspended, so this might not happen).
The underlining of incriminating passages is admittedly suspicious. The first Freepmails were posted on a now pulled thread at 11:05PM on 2/8. The underlining was put in a response to that same thread at 11:13PM on 2/8.
He's dead, that thread is pulled..but the deed is done...Nobody knows WHO is on the internet unless you have personally met them...
If he did that, he didn't tell NCPAC he was going to do it. More importantly, he didn't post the full exchange. He only posted what NCPAC said. The only possible excuse he might have is that someone got access to his FreeRepublic account and did things without him knowing. If that is true, it should be possible to track from where his last posts were made.