I get it, but it's insane. The case of Venice you mentioned is a bit less crazy.
Well consider the tower of Ulm was the tallest structure in Europe when completed; I believe it is also the tallest conventional stonemasonry building in the world without any kind of metal frame. Ergo, it is fragile.
But there is a bit of insanity here and that is the relative ease with which the base od the tower could be protected with a fence, a hedge of rose bushes or other flora, or cheap, simple ceramic tiling. After all, its not like jets of urine can shoot all the way up the tower; you are only talking anout 4-5 ft of coverage needed to protect it.