Read about what happened in Europe during the black death of 1348 - 1350.
Parents killed their children, children killed their parents, people dug up the dead, in areas all over europe cats and dogs went extinct because they were killed and eaten.
During the black death of 1348 - 1350 there was a story of a man and his son going to town to buy some food. On the way to town they stopped off at a cousins house. The cousin was dying of the plague, she she begged the man and son to take her child.
They took the child alright, they killed the infant, butchered it, brought it home and told his wife him and his son got a small pig. The wife cooked the child and the family ate it.
Never underestimate what people are capable of.
~ EDIT ~
I took a picture of the book this story came from if anyone wants to read it.
That reminds me of a story I read in a Jared Diamond book. He mentions that in New Guinea cannibalism is common and the word for eating people meat, when translated to English, is "long pig". I guess we taste like pork :/