Any time the great unwashed get a bit uppity, the powerful start whining about death threats. Violence and threats of violence are bad things without justification, but there's a big difference between receiving a nasty email and whining about it and genuinely feeling threatened. Like David Rees I used to get plenty of nasty emails (not so much recently), though I wouldn't say I've ever actually gotten something which was an actual threat ("I hope you die" is not the same as "I'm going to find you and kill you.") If any AIG employees have reason to and genuinely feel that their safety is threatened then I feel for them, but I'm a bit skeptical that there's all that much of that.
And a wee bit of advice: if you get an actual threat, call your friendly neighborhood FBI. They'll take care of it!