Amish school shooting

We've been watching CNN all day (as usual), and there was apparently a shooting in a one-room Amish schoolhouse in Lancaster that killed 6 people. The shooter, who it seems was not Amish, was also killed, and I think there's maybe as many as 10 injured. Here's the report from MSNBC's website.

Who would shoot the Amish? They're peaceful people.

On another note, it seems like there's been an awful lot of school shootings lately. What's that about?