First, the Bailey tragedy.
Then, a student shoots a principal in a rural Wisconsin school.
Now, a non-Amish milk truck driver has killed three Amish girls, and then himself in a one room school in Pennsylvania. The man, who was married with three children, and with a fourth child who died in 1997, said he was "acting out in revenge for something that happened 20 years ago" when he was a boy, and apparently chose the school more or less at random.
The Department of Homeland Security has invested a lot of effort into preparing rural areas to respond to unlikely terrorist incidents. We've discovered, time and again, that there are tragic threats to rural America. But, they appear to be home grown, armed, anti-heros without a cause, rather than foreign terrorists.