I'm not familiar with that show, but in real life you cannot take action into your own hand. Not because it's wrong killing say someone who abuses children, but because the law has to protect those until proven guilty. Many times people have taken the law into their own hands and killed innocent people. Then it's like oops.
Hey yeah interesting thoughts and i think thats very true.
Have you seen the movie called The Hunt, i think its a very good and informative example of what you mentioned here.