As a parent with teenage or almost teenage kids, I can confirm that I don't worry about my kids getting shot at school. I do worry a bit about generic terrorist attacks, but I'd guess that risk is roughly the same as any city in the US.
Another worry I don't have is health care. Even if I loose my job, my family will still get decent health care. To me, that's more concrete than a school shooter.
Welcome and enjoy your move.