There are supposed to be somewhere near 130,000 public schools in the USA. The fact millions of kids go to these and they're almost crime free says a lot. Yes there are occasional tragedies like Newton and last week in Atlanta, but as you say, considering the number of student-days... it's a very, very low %... like <0.001%...

Doesn't mean we don't strive for perfection... we do but it's like the airline safety... near to perfect as you can get and not be 100.00% perfect.
David (OFI)