Looking at the numbers, however, your kid has about a .0001224899598% chance of getting murdered at school & a lot of that has to do with the recent horrific massacre in Newtown. Taking that out of the equation your kid has a .0000702811245% chance of not coming home.
But getting to school? On a bus your kid has a .0002307692308% chance of dying. That's about twice as likely as a murder but doesn't take into account car accidents & those deaths are probably all operator error and not due to anger, jealous rages or mental illness.
So, by all means, let's arm & train our teachers (& pay them accordingly for their new skills & responsibilities), make schools more like prisons than they already are, employ more armed guards & make our kids utterly paranoid so we can create more mentally ill people who might go out & massacre folk.