My son asked, would that be someone like the  "Equalizer" or the "Punisher"?  Son seems to think that the judicial process is being laughed at and the bad guys just walk away.  It's a difficult question to answer.  I asked him what he thought should be done.  I am sorry to say the response may be deemed politically incorrect by SA standards so I will not post.  Personally, I liked what he and his bruddahs had in mind.