Why would someone do this?

I read in the daily newspaper today that over 100 headstones and monuments in one of the local cemeteries were knocked over last night, many of them completely destroyed. Many of them were knocked over and then purposefully smashed, most likely with a sledge. Some of them dated back to the 1800s. Why would someone do this? What is there to gain from destroying headstones and monuments which families have bought to honor and remember deceased family members? I suppose if someone were angry at a particular person, they might destroy a headstone belonging to a relative of the person. While that would still be extremely mean and low, it’d make sense. But just to rampage through a cemetery destroying stuff? Why? I really don’t get people sometimes.