SALT LAKE CITY — Pablo Mastroeni was sitting on the porch of someone else's house, learning how to live in a foreign country he already loved, when tragedy remade him. "I was five, and we'd just moved from Argentina," he said. "I was sitting on the front stoop of my uncle's house where we were staying. ... I heard this commotion inside. It was my dad in a fit of rage, literally punching holes in walls, and I walked inside, and I see him frothing at the mouth.