That's an interesting question, but I have to say one thing about that. The monument was extremely heavy, so to topple it was a deliberate act. The outpouring of support from the community to help restore, replace and shore up that memorial was simply outstanding.
One thing that did strike me was that for weeks afterward that memorial was tended to, kept clean and kept free of any kind of debris, rocks, grass or anything. In my mind, I thought whoever perpetrated that act perhaps had a moment of reflection, realized what they did was wrong and as their way of penance took care of that memorial. It's completely unfounded, but I would like to think that whoever did it initially realized the error of their ways and tried to make amends.