Until the MENTAL ILLNESS that causes folks to do stupid crap is addressed, all of this sort of happening will continue.
Choose what ever mental illness ya want, it is not just the OBJECT ( in this case a friggin Rock)
that causes harm, that is the issue,
but the one(s) who USE such objects to cause issues, IS THE PROBLEM.
Objects that can cause injury or death been around long time, so has Mental Illness.
So, which is the Cause to create the Effect?
As in any problem, Remedy the CAUSE, & the EFFECT from the cause will reduce.
Simple logic.
Tell me how I am wrong...