This does not apply to all of them, though. The ones that the Dark Lord snaked out of Azkaban are probably his élite---tough, fanatical and utterly devoted to him for his own sake. That would explain people like Bellatrix Lestrange. She tortured Neville Longbottom, just as she had his parents, to try to get Harry to hand over that stupid prophecy. He'd have done it, too---the softie---had the Order not interrupted things.