[ARepublicanForAllReasons]

Ok, so it's PRIVATE land. That changes my analysis, but just a little. A simple case of theft, and perhaps desecration of a religious monument.

Land is cheap in the desert. Let this group buy their own parcel and erect whatever monument they want! (After serving their sentences)

[RedMDer]

(After serving their sentences)

I would only add... After serving their very long sentences.