robomatic,

That's pretty much as I see the issue. If it's as part of a "general history of law" presentation -- as it might be as part of a piece of public art that includes things like a representation of the Code of Hamurabi, etc. then I wouldn't be against it. In that context it's just acknowledging, generally, the development of western law.

But as a manifestation of a "Christian nation" I'm firmly against it, and I think that, as the fellow you paraphrased said, it profanes the ten commandments -- presenting them as some sort of talsiman rather than what they are.