Less than two years after her six-year-old son was killed at Sandy Hook Elementary School in 2012, Nicole Hockley found herself in an Ohio church basement, teaching the inaugural class of a program she hoped would prevent future school shootings . Born from the profound grief of one of the nation’s worst mass shootings, the initiative, known as "Say Something," teaches students to identify warning signs among their peers and urges them to report any red flags to an anonymous tip system or a trusted adult, aiming to avert violence. Since that first class in a Columbus church, the program has been presented to thousands of students nationwide. It has generated nearly 395,000 tips, covering concerns from threats of school shootings and suicides to drug use and bullying. Its effectiveness was starkly demonstrated last year when a tip led to the arrest of an Indiana student who had threatened a shooting at her school.…