I dunno if this has been brought up in the seven pages prior, though I did not see it.
Y'know, before this it was all about MMPA ratings. When ANH came out, there was no PG-13, so it was rated PG despite being far more violent than you can do in a PG movie today. When the movies were re-released, apparently part of keeping the rating at the lower level was changing the event so it wasn't "murder" but instead "self defense." I'll let others quibble about the meaning.
Whatever, man. I'd totally buy that. He wanted to keep his PG rating. (Insert rant about how mass extermination can be in a PG movie, but some bare skin throws you up to R here.) You got to deal with the organizations out there and their demands on your media. The real world constrains art.
I'd have stuck to that story, George. Just sayin'.