The point is not about justice but to get another person, particularly a childl, in the system. Justice in this country is mostly an industry.
Years ago I was standing on my back patio when I got shot in the head with a BB gun from the kid across the alley. It hurt like hell and I was bleeding like a stuck pig. I saw the the little brat in his backyard with the gun so I ran over and opened their gate to the backyard. He had already fled into the house so I started banging on the back door.
He was the only one home, got scared and called his parents. They in turn called the cops. When they got there I had blood all over my face and clothes and must have looked pretty bad. To make a long story short, the cops were gonna charge ME for trespassing! They said I should not have entered their backyard without permission! Even IF I was shot. I threatened to sue and that shut it down real quick.
Anyways, the kid got punished by the parents and I went on my way. Six months later that BB, unbeknownst to me, was still in my head and had surfaced to the top. I had it removed and all was well.
So yes, BB guns can be dangerous. But charging a 7 year old with a felony because he shot at a car? REALLY??