The reason that Lucas changed E4 in order to have Greedo shoot first is simple; Lucas is a life long Hippy jack ass who revels in political correctness and communist ideology. Since Han eventually became one of the OTs heroes, it is politically incorrect for Han to shoot Greedo in anything but self defense. In future versions Han will probably sue Greedo in civil court for firing at him instead of firing back. If you have ever seen the old deleted scenes from this film, Lucas had originally included a three minute anti-Vietnam war rant between Luke and Biggs. Thankfully it was dropped (unlike the prequels which are loaded with this political trash). Before responding to my comments here please understand that I have no political bias, I am equally as sickened by extreme political garbage of any type being shoved down my throat while I'm trying to enjoy a fantasy adventure film. It is especially irrittating though when someone has such an insistance on injecting an ever changing sense of political correctness. Han can't shoot first because deep down he is a good guy, my god that Lucas is a horse's ass.