On a recent Wednesday afternoon, Rosa Marroquin peeked out the front door of her son’s pre-school at 1954 Mission St., between 15th and 16th streets.
Gripping her three-year-old boy’s hand, she looked left and right a couple of times before walking out. She had reason to be fearful: A few months ago, while leaving school, Marroquin said, a man ran past them, followed by two others holding a knife and a gun.
“One of the men screamed, ‘You better run because you’re dead if we catch you,’” she recalled. “I panicked and pushed my boy against the wall and used my body as a shield to protect him. The man got in a car and escaped, but we could’ve witnessed a murder.”…