He is a successful professor in Harvard University.
He explains about social justice by using a couple of examples.
For example, you are a respectful mayor in your city.
You have a younger brother, who is a notorious gang.
The younger brother has killed lots of people and he has been wanted for a long time.
One day, police called and asked you where your brother is.
You could guess where he is, but you didn't tell police the truth because your brother is your family.
Is what you did justice or not?
If you were the mayor, can you tell the truth?
If I were him, I would tell police because the brother might kill more people afterward. Also, people who were killed by him must have had their families and friends. They might be in deep sorrow still now.
The brother should know his resposibility and he should compensate for the people he killed.
I thought that thinking about justice is a study only for philosophers.
However, we need to think it through seriously.