It is not unlikely at all. Carving it himself -- or herself, we don't have any indication who, or that it was even a soldier who was aggrieved -- is one of man

It is not unlikely at all. Carving it himself -- or herself, we don't have any indication who, or that it was even a soldier who was aggrieved -- is one of many possibilities. What is ignorant is to insist only the one alternative, among many, is possible, and that slaves were never ordered to do tedious chores, and that a soldier (or whoever) could not have had a slave, and that said slave could not be literate. All officious BS: what we have is a rock. What we know is, exactly, that somebody carved it.