That is your religious biases showing. I am an agnostic,and you surely don't speak for me,or anyone else that doesn't follow your religious doctrines. Or that pretends to,anyway.
It represents one of the earliest examples of law that isn't at ends with our code of jurisprudence.
Posting "an eye for an eye" might encourage people to take the law into their own hands.
And many of those Commandments are incorporated into secular law:
Thou shalt not Murder.
Thou shalt not steal.
Thou shalt not bear false witness against thy neighbor (perjury).
Honor thy Father and mother (or be adjudicated as an "unruly child" and taken into State custody).
Keep the Lord's Day Holy (Blue laws, no matter how you feel about them, and with an admitted Christian bias of a Sunday sabbath).
So, like it or not, those Commandments still have a large influence on everyone.