Many of those involved with the Original Trilogy think otherwise, and they were ON SET during the production. Harrison Ford has come out against the constant tinkering Lucas does, and "having Executive Producer control" does not mean Lucas CREATED the OT, only that he could -if he saw fit- say no to the Director, the Screenwriter, the Cinematographer, the Producer, the Cameramen, the Actors, the Editor, the Sound FX department, the Composer, and hundreds of other people who CREATED the OT.
They created the OT, Lucas (along with the real Producer) could only REVIEW and CONFIRM their creation. It's a pretty easy concept to understand, but it seems to go over the head's of many Lucas Fanboys.
Lucas does have the LEGAL RIGHT to screw up the OT, but he's no different than Ted Turner attempting to colorize classic movies. Both own the legal rights, so they can do what they want with someone ele's creation.
But that legal right does not make hacking up classic cinema morally right.