Yes, I agree that many people have a knee-jerk negative reaction to lawyers, prosecutors, judges, the criminal justice system, etc. And I also agree that such a view is unfair and uncalled for. But there are also police officers who don't follow proper procedure, prosecutors who are ambitious beyond reason, judges who have private agendas, etc. Granted these are in the minority, and most civil servants take their responsibilities to the community and the public very seriously.
The rub is that if you come to the attention of the criminal justice system, such as a result of being forced to use lethal force in self defense, you will not know immediately whether you are dealing with one of those vast legion of thoughtful and ethical civil servants or some aberrant one. It therefore is wise to be wary, to understand your rights and to be prepared to attend to matters in a way that doesn't needlessly expose yourself. If you are dealing with a professional and ethical police officer or prosecutor, he will understand. And if you have the extraordinary bad luck to be dealing with the other kind, you may at least be able to limit your grief.
As to the Duke lacrosse players, I don't believe that they sued the University. See
http://www.newsobserver.com/content/media/2007/10/5/20071005_laxlawsuit.pdf.