My initial opinion was that some adults failed their duty to protect minors. He was looking like the kid in Rintintin TV show and there was no way he could have been confused with an adult.
The other adult vigilante should not have called him or should have sent him home. Similarly, the policemen who gave him water should have sent him home. They didn't.
Then after the trial, he started to brag about it, and make a show of himself. He showed what he really is: a little piece of fascist non-convicted killer (and a liar, as someone else recalled me).