By AMY TAXIN, KEN RITTER and DEEPA BHARATH LAGUNA WOODS, Calif. (AP) — A gunman motivated by political hatred against Taiwan chained shut the doors of a California church and hid firebombs inside before shooting at a gathering of mostly elderly Taiwanese parishioners, killing a man who tackled him and possibly saved dozens of lives, authorities said Monday. David Chou, 68, of Las Vegas — a U.S. citizen