Reading some parts of the law of Moses can be saddening. There are many cases that the law of Moses that are clearly in place simply because of the hardness of the peoples hearts. Had they been a more righteous people, they could have received a much better law. The could have been a much happier people.
And the same is true for us.
When Zion is built, certainly they will look back at us and wonder at the misery that we inflicted on ourselves through the hardness of our own hearts.
Living the higher law is always living a happier, more delightful law, that makes one gape at the sorrowful consequences of living anything else.