In his book, Flim-Flam!, magician and skeptic James Randi makes a potent argument for decrying evil wherever it is found:
"Some perhaps reasoned: If he were a fake he would not have had the support he displayed and the endorsements he advertised. Those who might have been misrepresented in his claims surely would object, wouldn't they? His tricks -- if he had any -- would surely have been exposed immediately, don't you think? Yes, that is what should have happened. But no one spoke up and denounced [Jim] Jones early in the game -- or at any point prior to the mass murder/suicides of November 18, 1978. U.S. Congressman Leo Ryan, certainly a hero among heroes, was one of the very few who bothered to get up on his feet and bitch about it. Ryan, who flew to the jungle settlement to investigate rumors of strange goings-on there, got his face blown off for his trouble. To thank a man like that is impossible -- except by following his example and yelling loudly when another Jones comes along."