Thanks for answering my question about the pagans kings of old.
How about His dealings under the New Covenant? He commands His children under the New Covenant to care for the poor (Read James), but not governments. Those are told to punish evil doers and reward those who do good (Romans 13).
Jesus didn't tell governments "not to", He just didn't address it. But that's not surprising, because Jesus didn't say much about governments except to pay taxes.
Jesus' commands to individuals to care for the poor are similar to Old Testament commands to individuals on that matter. That Jesus didn't specifically address the responsbility of Government with regard to the poor, shouldn't imply that things had changed in that regard from the Old Testament. After all, the new covenant was more about God's relationship with individuals and not government. And that God held pagan kings responsible indicates that this governmental responsibility exists outside of both the old and new covenants.