Why do so many people make death threats out in the open on Twitter?

Impunity:  they've been dominant culturally, socially and politically for so long that they don't feel they can lose.  But they can.  And they are.  And it's so fun to watch them.  I love the 'new civility', don't you?

TWITTER USERS WISH DEATH ON SCOTT WALKER, and Prof. Jacobson asks: Why do these people, many of whom are professionals, feel no fear in expressing such death wishes in the open? They’ve lived for years in a culture of impunity. But that’s changing faster than they realize.