Why do people take things that don't belong to them?

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Please tell me the answer to this question. My sons brand new bike was stolen from the backyard at my moms house. I'm pretty sure I know that the kid upstairs took it. How do I find this out for sure? I have been waiting to see him but I haven't seen him to even ask or follow him to see where he hangs out. I just bought this bike and i'm really ticked off that someone thinks they have the right to go and take it. He was so upset I just went out a bought him another brand new bike to ride. It makes me so angry that someone else can do something so terrible. Can anyone tell me how I can catch this kid? From what I hear he sells the bikes for drugs, his own brother says this because he has stolen bikes from him before too. I am gonna catch him in the act.