Moses simplifies the whole duty of Israel (and of humanity) by crystalizing the moral law into a single command to love God supremely.
Nothing should be considered outside the scope of God's authority.
God's loving discipline brings us face-to-face with our pride.
Even guilty people deserve to be treated as those made in the image of God.
Religious truth is not false for being narrow any more than mathematical or scientific truth is false for the same reason.
Compassion for victims is sometimes forgotten in a misapplied concern for their oppressors and murderers.