When did this person learn that humans are social creatures? In what school did they study that people should love each other? Where were they taught that doing wrong harms the wrongdoer most of all? They never learned these lessons. They don't believe them. So why wouldn't they do what seems best for themselves? Your neighbor threw stones at your house. Did you do something wrong? No. Your windows got broken. Are you just a piece of property? No. You're a free human being with the power to choose. So what should you do? If you act like a wild animal, you'll bite back and throw more stones. But if you want to act like a human being, think about what you're capable of. Check your toolkit. Remember what abilities you were born with.
For when did he learn or in what school that man is a tame animal, that men love one another, that an act of injustice is a great harm to him who does it. Since then he has not learned this and is not convinced of it, why shall he not follow that which seems to be for his own interest? Your neighbor has thrown stones. Have you then done anything wrong? But the things in the house have been broken. Are you then a utensil? No; but a free power of will. What then is given to you (to do) in answer to this? If you are like a wolf, you must bite in return, and throw more stones. But, if you consider what is proper for a man, examine your storehouse, see with what faculties you came into the world.