Op-edTwo years after the shootings at Sandy Hook Elementary School in Newtown, Conn., it's tempting to think of the horrific incident as a remote, rare event, unlikely to ever hit home. That would be naive. There have been at least two gun-related incidents in my children's Baltimore County school district in the past two years alone. And while school systems nationwide, including in Baltimore County, have spent a fortune on security measures since Sandy Hook, often following the NRA's advice of