In my opinion, since it does not appear to be under rational control or guidance, I'd say the hate is a neurosis.
Breitbart contended that the left’s bullying of people like Carrie Prejean is a strategy to intimidate and discredit such adversaries. Leah pointed out that even after the Democrats swept to power last fall and have taken office this past January, their supporters on the blogs (and in the comments sections to conservative blogs) and sometimes even in the corridors of Congress and halls of the White House have become even more mean-spirited, more antagonistic, more vindictive than they were when they were out of power.
They do seem to have this “need” to hate, to attack conservatives. In victory, they have shown no magnanimity.
So, I’m wondering, is this hatred a strategy to discredit us and more easily maintain their power or a neurosis, a psychological “need” to attack others so they feel better about themselves?
On the other hand, BlueCrabBoulevard finds evidence of some coordination and control.
PREVIOUSLY, on the subject of liberal hatred:
Nora Ephron says the election will be about "hate"
Democrats projecting hate onto other Democrats
Hating Bush and Cheney more than Saddam
Liberal logic: "What's irrational about hating George W. Bush?"
Hating those who might own a gas-guzzlers except if they're Democrats
Congressional hater accuses Pres. Bush of killing for his own "amusement"
Imaging that the "right-wing hate machine" is mugging liberal talk show hosts
And, speaking of out of control emotions, there is nothing like a "peace" protester:
Peace protester confesses to murder
Three peace protesters arrested for 3rd degree assault