Contrast and Compare makes the case. To that end, I recommend two films.

Just Mercy will introduce you to the work of Bryan Stevenson who also created The National Memorial for Peace and Justice. The film is as inspiring and the man himself.

Clemency forces you to confront the inside of prisons where everyone who enters is condemned — without exception.

These 2 films should be enough to convince you, discrimination has deprived everyone of everything humanity truly has to offer.