MEXICO CITY - President Felipe Calderon yesterday charged that the US government, along with American drug consumers and gun dealers, was partly responsible for the deaths of 52 people killed in an arson attack at a casino in Monterrey. “The economic power and firepower of the criminal organizations operating in Mexico and Latin America come from this endless demand for drugs in the United States,’’ Calderon said. “We are neighbors, we are allies, we are friends, but also, you are responsible. That is my message.’’