I believe that the damage was occurring out of sight of the drivers; from a picture I’ve seen, it appears that a mound was growing on one side of the fence, and as it grew it slowly pushed through while dumping continued on the other side (out of sight). It is a ridiculous thing to have happen; there was just so much snow, and so much pressure on the mayor, they probably went about it in a very sloppy manner.
Come on, they knew there was a cemetary there. Do you really think they had no idea what the snow would do?