Unfortunately, you are so right.
It isn't the size of the bullet, its where you place it.
I'd rather be talking about the DRUGZ that Psychobabblers had in play, than the "gunz" that seem to fixate everyone.
It isn't the tools that they use, its what's between the ears that needs fixed.
***223 seemed to be adequate to kill some kids.***
.22 Rimfire from a Winchester 74 will do the same. So will a baseball bat or an iron pipe.