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What am I supposed to feel in the face of injustice?

I saw a video of a soldier who hit a disabled man and I did not feel any anger, I also saw another in which they did not let a woman in a wheelchair enter a restaurant and I did not feel anger either, I also saw a video of a woman hitting a month-old baby and it was the only way to feel unpleasantness but I didn't feel anger, it's not that I'm incapable of feeling anger, I do feel it but injustices don't make me feel it.
What am I supposed to feel in the face of injustice?
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