
What this misses is the teachings of Christ which happened in the New Testament. Both of those biblical quotes are the old testament.
If we are supposed to ignore everything for the Old Testament then why did God even write it down?
We aren't supposed to ignore it, obviously. It was rule of law at what point in time and shows the history and growth of God's chosen people. It is important to study our past, even the bad parts, so we can avoid making the same mistakes again.