HAMBURG Horst Mahler, a former Marxist urban guerrilla and lawyer for the Red Army Faction, now represents the extreme right National Democratic Party. But the virulence of his views has not diminished, and his outspoken comments on the Sept. 11 terrorist attacks in the United States have landed him back where he was decades ago - in court. Last week, Mahler went on trial here on charges of approving of crimes and inciting violence, and he could face three years in jail if convicted. A few weeks after the attacks in 2001, in a broadcast interview with Norddeutscher Rundfunk, the...