The correct answer to this open question is the following.
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The ethics behind a social justice cause are based on the moral idea that humans deserve the same rights, equality, and "blind" justice, and opportunities. No exception.
Social justice is not determined by the color of your skin, your gender, your race, your age, the name of your family, or social class. The ethics of social justice make us think that humans are brothers and sisters that deserve the same opportunities to thrive in the workplace, in politics, in economics, and that there is a fair chance so everybody can have their best shot.