The amphitheatre would be extremely hard to vandalise since it is constructed with large square blocks of stone, quite an impressive piece of work actually.
The variouis statues however, have certainly suffered the fate of decapitation, an obvious act of vandalism which cannot be denied since it is quite apparent and deliberate.
Whoever is responsible and for what reason is not the point, the fact IS, the statues have been mutilated, SHAME.