I don't see what the big deal is. It's not like it was a gun or something.
Seriously though, this is some sick and twisted sh*t. I'm tempted to chalk it up as another symptom of a dying civilization, and maybe it is, but I also guess unhinged lunatics can happen anytime. To borrow a line from The Walking Dead, I'm not sure there's anything you can do for these two girls other than tell them to go "look at the flowers".