For those unaware of the importance of monuments.
Dueteronomy 19:14"Thou shalt not remove thy neighbour's landmark By which one man's land is distinguished from another; for so to do is to injure a man's property, and alienate his lands to the use of another, which must be a very great evil, and render those that do it obnoxious to a curse".
This is hardly the only ancient text dealing with monuments. It's a long held foundation principal of western civilization that monuments are important to property ownership.
Can it be argued that the act of pincushioning is, at least partly, "removing" thy neighbour's landmark? It's certainly casting aspersions on the landmark. Can that be considered slander of title?
What is the surveyors responsibility when confronted with disputing monuments, what do you do to "protect the public".