Politics is not a part of Torah thought. I do not know from where the Reform get the idea that "social justice" is somehow a part of Torah While on one hand, I can see some slight indications of some kind of government in Torah, but these are only slight. Even for a king that is made by a prophet, there is an argument in Tractate Sanhedrin what powers he has. To one opinion all the threats of Samuel were legal. To another opinion they were just threats, but not actual legal powers.
Note: Samuel got angry at Israel for asking for king, and even made a miracle to show the people of Israel that God was angry at them for asking for king . Then he told them all the terrible things that a king would do to them, To one opinion, these threats were just Samuel telling them what in fact a king would do, not that they be legal. To another opinion these things that a king will do would be legal.
In TORAH the mitzvah of making a king is only when people ask for a king. But the prophet Samuel showed that asking for a king is a terrible sin. It is like brining a sin offering. There is a mitzvah to bring a in offering if one has sinned, but it is better not to sin in the first place.
