Interesting that the "be safe" rock was the one destroyed. Maybe it wasn't someone who wants to see the world burn or someone who gets perverse pleasure out of destruction. Maybe it was someone who lost a loved one to covid.
I can imagine maybe a teenaged boy who lost his Dad to covid and Mom is grieving and his world doesn't feel safe anymore and seeing that rock just triggers all his pain. So he shatters it. Because those world just hurt too much to keep seeing them.
I'm making that up, of course. But if it was someone who just loves to destroy things for pleasure, wouldn't that person have destroyed more than that one? The one that said be safe?