When you become indifferent to injustice that is a problem with faith. Prophet Muhammad (PBUH) hated oppression. He cared for the oppressed.

Prophet Muhammad (PBUH) loved what Allah loved and hated what Allah hated. Allah hates oppression. Prophet Muhammad (PBUH) fought injustice whenever he encountered it.

If someone is being wronged then you should stand up for them on their behalf. This is what Prophet Muhammad (PBUH) used to do before he came to Islam and after.

There are so many hadiths that show how Prophet Muhammad (PBUH) stood up for anyone who was oppressed.