It was important, Dumbledore said, to fight, and fight again, and keep fighting, for only then could evil be kept at bay, though never quite eradicated.
The evil like power, power over people, and they want to see you in fear. They want you to know you are going to die. So they'll talk. They'll gloat. They'll watch you squirm. They'll put off the murder like another man will put off a good cigar. So hope like hell your captor is an evil man. A good man will kill you with hardly a word.