One of the most unpleasant things about human beings and the world in general is sitting down and trying to figure out "Who would do something like that?" and within about two minutes generating a list that begins with various groups of Muslims that we are effectively warring on, right-wing militia nuts, diehard Tamil separatists, rogue PIRA fanatics and ends up with the ever-popular "random nutter". Homo homini lupus, damn it. We are our own worst enemy.
I cannot express how grateful I am that I do not have to sit my little daughter down tonight and explain the bad thing that happened to her first grade teacher. I called the school and Mrs. Sammons' family has been in touch to let them know she's okay.
I cannot express how horrified I am that someone else is going to have to sit their little girl or boy down tonight and explain the bad thing that happened to their mommy, daddy, big sister, uncle, or their first-grade teacher...

We must be utterly fucking mad.