He doesn't understand how his grandmother could be capable of loving an animal. So he decided to torture it to death and relate the experience to a group of strangers in minute detail.
It really irks me that these idiots think that their ideology is the only one, and that everyone has to live by their rules. That even goes for the one's that believe opposite dogma as well. Because god is the only god.
Get the fuck over yourselves and grow the fuck up!