Deuteronomy 8

In Deuteronomy 8 God says through Moses that the 40 years of difficulties which were brought upon the sons of Israel were brought with an intention of disciplining the people, like father disciplines his son.
Here the exat moral stand of Moses are very much clear. The moral stand is pretty simple. He wanted his people to live happily forever. And by happiness he didn't mean just exploiting pleasures out of life. He meant happiness in real sense or lets say he tried to meant and define the happiness for his people. He definitely tried to connect the state of being happiness with a sturdy conscience.
Just as Plato made the mistake while defining his Republic to put aside the poets from ideal society, so also Moses has his own mistakes.
The ideology he tried to state is definitely not the ideal human existence but in human history it surely could be considered as one of the well tried steps towards towards achieving the ideal human existence.
I think Christ was well aware of this well-tried step, thats why he didnt say a criticizing word against it.