What is wrong with our courts?

What is wrong with our courts? Courts are supposed to be the place where the innocent are vindicated and the guilty are sentenced.This has been one miserable year. When your blood family member turns on you, it can be devastating. My 16 y/o grandson has turned out to be a demon seed. He has been dragging his father through the court system for a year now for falsely accusing him of beating and trying to kill him. This kid ran away from home and was using drugs for three days. We filed missing person reports and did what we were supposed to do as parent and guardian. He was returned home by the transit police and a social worker at 3 am on the third day.
His father filed unruly and then he ran again, this time being gone for another 3 days and being captured by the police when he was caught stealing from a department store. His dad was called to pick him up at the station and then a few minutes later was told to meet them at the hospital, but wouldn’t say why. Upon arriving at the hospital, we were told he had some bruising and an injured eye. He had told the hospital his father had tried to kill him. Upon hearing this my son and I both said he could not return to our home,so the DCFS had to scramble and take custody of him. After several meetings with DCFS it was decided by them to take temporary custody and as a result of their investigation, the accusation against his father was unsubstantiated. Then that weekend, he received a call from a detective who said he was investigating the case. A BIG MISTAKE WE MADE WAS GOING DOWN TO TELL HIM OUR STORY WITHOUT LEGAL REPRESENTATION, because the next thing we knew he was getting a notice from the court for arraignment on charges of attempted murder, aggravated assault, child endangering and domestic violence.
This kid did this because he wanted freedom to come and go as he pleased. He was frequently grounded to the house because if we let him have a little leeway, he would always get into a fight or have neighbors calling about something he did. He didn’t want to follow the rules. My son raised this child and his sister as a single parent with of course my help. Their mother abandoned them when he was 3 months old and his sister was 15 months. I sacrificed myself to help raise him and his sister and this is the thanks we get.
This has been ridiculous. There is no evidence to continue my son’s trial against him and the courts continue to pursue this. Me, my other son and granddaughter are witnesses, and have to go to court every time, only for one side or the other asking for a continuance. The biggest problem is my son has a public defender, which is a danger in itself. They have a large caseload and they really can’t give a case their full attention. My son is unemployed and I just don’t have the money to afford a lawyer.
On the other hand, my grandson has been misbehaving so badly under the foster care system and they just allow him to do so. Knowing this, the court has not dropped these charges.