Chief U.S. District Judge Ruben Castillo tries to see the big picture.On Friday, he began his annual State of the Court address by asking for a moment of silence for the police officers shot in Dallas the previous day — and for the victims of excessive force everywhere.“Violence never is the answer to violence,” Castillo said.However, he said, violence is an issue that continues to confront society.At the Dirksen Federal Courthouse, trial judges have dealt with the issue “over and over again&rdquo …