Seeking to hold Chevron Corp. accountable for its practices overseas, an attorney for 19 Nigerian villagers urged a federal jury Tuesday to find the oil company responsible for the killing and wounding of four Nigerians during a protest at an offshore oil platform...Chevron attorney Bob Mittelsteadt responded that the company regretted the deaths and injuries but argued that Chevron was not responsible for the actions of soldiers and police who were responding to a security threat.