Is that a fact? What's your track record?

We, not me.

"Your" can be plural.

But that is what psychology does,. Philosophers are interested in justice because they want just societies....they want improved versions of things.

That is step 2. Once we get an algorithm that reliably predicts our feelings about justice, we can codify it into law.

Once we understand the principles behind things, we may accept contradictions to our feelings.