A lot, perhaps most, people do not want to testify in Court about anything. When I was a prosecutor, almost everyone had an excuse or a conflict. It had nothing to do with politics. Usually, they were just lazy or did not want to miss work to perform their civic duty. I just hit everyone with a subpoena and, if they squawked, I told them if they did not show I would have them arrested.
Did it ever occur to you that this mentality may be part of the problem?