Titus Andronicus as a tragic hero

I can't say I sympathize with him because he has been a flat character of rage for too long. I agreed when Alexa said we should have seen him before the war had the effects that it did on him. I think he killed Lavina out of mercy because her life would have been a living hell in her condition. He may have started out as a hero, but things escalated too much by the end and the message of this whole story to me is that revenge is never over, therefore it never does any good. Once you do something evil to someone and they get you back for it, then they may want revenge for that act and so on. It's a vicious cycle where nobody wins, and I think that's what Shakespeare wants us to take away from this.