What's with the Duff Death Threats?

Hilary was faced with yet another death threat while being interviewed by MuchMusic yesterday in Canada. The first one, ended in the arrest of two men, one of who is just about to get out of jail! In this incident, a man in the crowd outside the studios evidently shouted a death threat at the star at which time the police tackled him and took him away. Apparently Hilary wasn't too bothered by the incident to cancel her interview with the network. Duff continued on like the consummate professional that she is, smiles and all. Isn't she looking cute in her bright summer yellow dress? Seriously folks, what's with the Hilary Duff death threats?