It would be interesting to see the numbers on that. I don't think anyone has real numbers there, but it would be a fascinating study if someone were able to do it. Common sense logic tells me that people wouldn't issue death/rape threats or swat people under their real names. But you're right about there being a lot of bad stuff being posted under real-name accounts. So you've really got me thinking about that one, you could indeed be right.

Oh, and about the swatting thing: that one doesn't require the Internet, but I think the Internet helps by popularizing it and sometimes providing the target's address.