What a chilul Hashem and tragedy. Who's to blame? Surely the woman too, but if her father had said those "racist, intolerant" things in the Torah about who Ishmael is, and had raised their kids not to see everyone and every idea as the same, then maybe we'd loose less. Cry for this woman, and avenge her soon-to-be blood by not being afraid to tell Jews, even "innocent little kids we don't want to say not-nice things to" what's what in the world, like Hashem did for us.