[general_re]

A historical display does not implicate the First Amendment Establishment Clause, does it? Not to mention that the courts do not now, nor have they ever issued advisory opinions about what might happen in some hypothetical situation - all they can do is deal with the facts arrayed before them. Facts which, in this particular case, are clear as to what the intent of Moore was...

[inquest]

A historical display does not implicate the First Amendment Establishment Clause, does it?

We weren't talking about the establishment clause; we were talking about the equal-protection clause. If posting a religious view while excluding other religious views violates equal protection, does posting a secular view while excluding other secular views violate equal protection? That's what this boils down to.

Not to mention that the courts do not now, nor have they ever issued advisory opinions about what might happen in some hypothetical situation

You need to read more court opinions and arguments. They constantly ask out loud what the implications would be of a particular ruling - If we allow X does it mean we have to allow Y? If we prohibit A does it mean B must go, too? They simply can't do their jobs otherwise.