To be able to destroy with good conscience, to be able to behave badly and call your bad behavior ‘righteous indignation’ — this is the height of psychological luxury, the most delicious of moral treats.
Aldous Huxley, attributed — on the Web and in many books it is cited as from his first comic novel of ideas, Crome Yellow, but it is not in there.
Wirkman Comment 
A reader helpfully directed me to the actual source for the above passage. I will now put up a fuller version of the quotation, on MemeVigilante.com.
twv
[…] lines follow a much-quoted but mis-cited passage first published here 11 days ago. This quotation, above, completes the paragraph that I have published in these pages […]