2. No one should be the prosecutor, the judge and the executioner. In fact the aggrieved party should never be the prosecutor and the judge. Obviously the aggrieved party would be biased in favour of himself.
3. Matthias Chang is now in jail. His crime, if we can call it a crime, is that of allegedly showing contempt of court i.e. not showing the right respect of the judge. Because the judge feels he or she has not been shown respect, then the judge has punished him by sentencing him to a fine or jail. Matthias has refused to pay the fine because it would amount to admission of guilt.