Han shot first. There's no question about it. There was no need to edit the scene to make Solo's use of deadly force more justified. The instant Greedo trained his blaster on Solo, Greedo's life was forfeit. When faced with a deadly weapon, you don't wait for the other guy to pull the trigger. Why in the world was this scene ever tinkered with in the first place?
Why am I discusing this instead of getting on the road?
[If some of the comments no longer make sense, note that I just edited the lead-in to the 2nd paragraph to make my intended meaning more clear].