Who knows. I never get abusive emails (because I don't give out my address), so I can't really comment on the trends of abusive emails and such.
I can, however, comment on who you are accusing of giving bad emails. I know that Shay P claims that Bravo Sierra sent him an abusive email with some kind of virus, and thus he does not allow emails because of that. Knowing what and how Shay P and Bravo Sierra write, as well as yourself, I'm more willing to believe Shay P saying he was sent a virus than you saying Shay P wrote an odd abusive letter. Sorry, it is just that I can't imagine Shay P writing something that abusive, so maybe you just thought it was abusive.
As for Dead Silent and Blueberkut being the same person, I highly doubt that they are the same. Both have maintained distinct and unique writing styles, at least on this forum, and I can't imagine that it would be easy for one person to maintain two distinct online personalities without scrambling them up. As for Dead Silent being a fake Arab, I think that is utter rubbish. Dead Silent doesn't maintain the anti-Zionism (and for some antisemitism) that most Arabs here have. However, just because she is willing to question whether or not the Israelis are evil, unlike what she claims her parents tell her, that doesn't disqualify her from being an Arab. I think that might make you think that she is not telling the truth about who she is. I also get the feeling that her sarcasm is also lost on you, which could be interpreted as anti-Arabism at times. She is willing to look at the situation from both sides, and I also cannot see her sending emails that are weird.
Blueberkut hasn't been here in a while, and truthfully, I can't remember him too well, so I can't really comment on his likelihood on sending weird emails. I do remember enough to laugh at the idea that he might be Dead Silent, and also laugh at the idea that she (Dead Silent) is not an Arab, when there really isn't any evidence to prove otherwise.
As a side note, Scarfie seems to write very similarly to Dead Silent. I know Dead Silent claimed Lebanese descent, and I also seem to remember Scarfie claiming the same thing. Wouldn't surprise me if they are the same person; however, it would highly shock me if Dead Silent was in deed infact Blueberkut.