You introduced yourself by saying that you have changed your mind on your previous position. (I can’t tell if you’re being sincere or changing your position for the sake of the assignment. Either case is fine.)
You then proceeded to list a number of examples where acts of injustice were rewarded, and (questionable) acts of justice were frowned upon.
Straightforwardly, this is one way to engage the argument, however there is more that can be said about why they are good examples of what you’re trying to prove. Why might someone frown upon a person taking justice into his own hands, for example? What might Glaucon have to say about
We can write this or a similar paper for you! Simply fill the order form!