Let’s just ignore the reported fact that Trayvon does not have any sort of criminal record, violent or nonviolent, so he’s unlikely a candidate to commit random acts of violence, k?
He’s a juvenile. Not having a record as a juvenile is NOT the same as not having a record. His criminal record is unknowable.
The reason he is at the gated community is because he was suspended from school for 5 days. That's indicative of serious misbehavior. Minor misbehavior is "rewarded" with detention.