Crazy people are trying to call it self defence, how are we in a world where an argument on a train ends up in someone stabbed to death and people are like "oh yeah he shouldn't have followed him", sure yeah - I wouldn't of carried on an argument on a train - but that's basically irrelevant as the force used was so disproportionate, what the discussion was about before hand doesn't matter. You could argue self defence if he was on top of him punching his face in, not stood infront of him arguing.
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