To further illustrate how people's sense of decency and compassion can become derailed by religious zealotry, ancient Rabbis described/imagined the procedure for burning a person. Because the human is in God's "image" they felt it appropriate for the person to be burned from the inside.
R. Judah says: “Even he, if he died by their hand, they have not upheld the commandment of burning with respect to him. Rather, they should open his mouth with a pair of tongs against his will, and he lights the wick (later defined as molten lead) and throws it into his mouth, and it descends into his belly and burns his bowels.”
(b. Pesach. 75a; b. Sanh 7:2, 52a),