I agree that it can be frighteningly easy for a decent person to be lured into supporting evil. Propaganda is powerful. Lonely people can fall among evil companions all too easily. People who are frightened and confused don't think clearly, and it's easy to lie to them.
I don't think JK Rowling is a good example of a good person who was lured into radicalism. 25 years ago, she wrote about destiny being determined by birth. Like Orson Scott Card, she wrote stories about how if somebody's birth was right, no amount of bad actions can make them a bad person. It's a very common setup for fantasy. I grew up believing it, myself. But I really think I had to stop believing it to become a decent person.
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I don't think JK Rowling is a good example of a good person who was lured into radicalism. 25 years ago, she wrote about destiny being determined by birth. Like Orson Scott Card, she wrote stories about how if somebody's birth was right, no amount of bad actions can make them a bad person. It's a very common setup for fantasy. I grew up believing it, myself. But I really think I had to stop believing it to become a decent person.