while I don't blame the delivery guy for shooting Tony, I do have some sympathy for the deceased. The real blame must be directed at Tony's family. they are the ones responsible for his death.
The deceased was 16, certainly old enough to realize that when you threaten someone with deadly force, they might well kill you. His family is to blame for not teaching him that bad actions have bad consequences, but the deceased held up a citizen and died. His actions alone led to his death.