You guys who are saying get help, this is paranoia, etc. just do not get the situation here.
Read the thread, this guy is on his first lap around the block and he is smart enough to know that the world is full of troubles that he has yet to encounter.
This guy, (or you or I for that matter) could get conned, vandalized, held up, assaulted, or any number of other crimes.
What makes him different, all the other kids in his neighborhood do not have anything to loose. Further most of us have already met with and dealt with bullies, grifters, vandals, we learn how to deal with them, and then we learn not worry about them.