VAN NUYS — Oscar Valaderilla, 22, thought he was doing a good thing late Tuesday afternoon. “I just wanted to show my support for the marketing arm of the Hollywood film industry” he said in Spanish outside the intensive care unit at USC Medical Center, having lost three sons — ages 2, 3, and 5 — just hours earlier, and waiting for word on the condition of his comatose wife Esmerelda, also 22. Valaderilla stopped by a Burbank Taco Bell on the way home his job at the Mexican embassy, and brought a 10-pack of soft tacos, three tostadas, three extra large Diet Cokes, and a single Tomb Raider “Kids’ Meal” toy home to his family. The result would prove fatal. “First, Jaime put it in his mouth and choked, and he spit it up, then my wife took it away and broke it into four smaller pieces,” Valaderilla explained through a translator. “Then somehow… Little Herberto…Oscar Jr…. I don’t know… they all ended up choking on the pieces. I don’t understand. I thought this was America.”