They never do.
Rats appeal to the same gut reaction that the thugs in New Orleans are when they tell people "don't go to the convention center, it is just a plan to exterminate minorities by concentrating them then igniting the gas".
Goebbels and Stalin would be proud that such horrific lies about relief efforts and the government could be accepted by any rational person.
Liberalism is fueled by emotion. When you see pictures of children dying, people don't want to hear about what President Bush was or was not authorized to do at the time.
Now when things have settled and cooler heads prevail, then maybe they will see the light. Now the moonbats will never come around. I'm referring more to the conservatives who are blasting the President. There's no hope for the moonbats.