I just "saw", no, maybe read something that I didn't really like. How am I to react? You might, if you were in my position, ask, "where is justice in the world?".
I believe justice exists -- the mere fact that we are aware of its seemingly absence, there it is.
Think of it -- is justice laid on a silver spoon? When has it, in reality, ever been like that? You know the "absence" of justice. How were you able to know it? You have eyes, ears, lips, hands and feet. Should you use it?
Hear-says. The most effortful way of gaining and attaining knowledge. Oh, I can't force everyone else to believe in what I believe in. I just hope that at least in myself, I believe right.