One of Germany’s best-known satirists, television presenter Jan Böhmermann, took the stand on Monday as a witness in the trial of a man suspected of sending right-wing extremist hate mail to politicians and celebrities. Böhmermann took the opportunity to criticize the legal investigation, while claiming that the defendant himself was not the most important perpetrator of such crimes. It is a good development that a suspect had been identified and is on trial, Böhmermann said at the Frankfurt Regional Court. But it would be more productive, he suggested, to take action against the structures op…