As another person mentioned previously, why was the 7-year-old left unattended in an alley? Not to mention, there are many holes in your story. I'm assuming if this man just got out of prison, then he's paroled. Therefore, as a pedophile, he's most likely barred from contact or speaking to young children. If this is in fact real, I'd recommend discussing this matter with him and his parole officer. Why use violence to amend a situation that could be easily settled with diplomacy?