How does S.E. Hinton use evidence to prove that Johnny has lost his innocence in The Outsiders?

Johnny loses his childhood innocence before the story begins when he is jumped by a gang of Socs. Ever since Johnny was severely beaten, he is on edge, jumpy, and carries a knife with him. In chapter 2, Pony tells Cherry about the time Johnny was jumped by a gang of Socs four months ago. Pony recalls walking home from the DX station with members of the gang and finding Johnny's denim jacket in the middle of the road. Pony tells Cherry that they ended up discovering Johnny's body on the other side of the lot and says,

We were used to seeing Johnny banged up—his father clobbered him around a lot, and although it made us madder than heck, we couldn't do anything about it. But those beatings had been nothing like this. Johnny's face was cut up and bruised and swollen, and there was a wide gash from his temple to his cheekbone. He would carry that scar all his life. His white T-shirt was splattered with blood. I just stood there, trembling with sudden cold. I thought he might be dead; surely nobody could be beaten like that and live (Hinton, 29).

Johnny never was the same after he suffered that severe beating from the gang of Socs and made sure to always carry a weapon on him. One could argue that Johnny lost his innocence following his beating from the Socs, because he is terrified to experience that type of pain again and is fully aware of his dangerous environment.
One could also argue that Johnny completely loses his childhood innocence after he is severely injured in the church fire. After Johnny enters the burning church with Ponyboy, a flaming beam lands on top of him and ends up breaking his back. In chapter 8, Ponyboy visits Johnny, who is in critical condition, and listens to him talk about dying at such a young age. Johnny tells Ponyboy,

I don't want to die now. It ain't long enough. Sixteen years ain't long enough. I wouldn't mind it so much if there wasn't so much stuff I ain't done yet—and so many things I ain't seen. It's not fair. You know what? That time we were in Windrixville was the only time I've been away from our neighborhood (Hinton, 103).

Johnny's fear of dying and his reflection on not being able to experience the world reveal his loss of innocence. Essentially, Johnny is struggling to come to terms with the fact that he will never recover and will more than likely die at a young age. The fact that Johnny mentions that he no longer jokes about killing himself and is terrified of dying reveals his loss of innocence.