“The surest way to work up a crusade in favor of some good cause is to promise people they will have a chance of maltreating someone. 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
Simplified Meaning:
When you tell people they can hurt someone else while feeling good about themselves, they get very excited. They feel it is very special to act badly but think they are doing the right thing.