New York Times:

Although some criticized parts of his later work as too contentious, Mr. Carlin defended the material, insisting that his comedy had always been driven by an intolerance for the shortcomings of humanity and society. “Scratch any cynic,” he said, “and you’ll find a disappointed idealist.”

Still, when pushed to explain the pessimism and overt spleen that had crept into his act, he quickly reaffirmed the zeal that inspired his lists of complaints and grievances. “I don’t have pet peeves,” he said, correcting the interviewer. And with a mischievous glint in his eyes, he added, “I have major, psychotic hatreds.”

UPDATE: My brother Jason adds: