George could do anything he wanted to his movies and since they're not public domain and don't legally belong to the public or the fandom as a whole then what we say about the changes has no legally-binding effect, nor should it, really, as much as we (justifiably) don't like some of the things he's done. Star Wars is a trademark and a private creation, not a United Nations World Heritage site.
All of that said: some of George's changes are just damn stupid and insulting to the intelligence of the fans and they're more annoying and distracting than they are supposed improvements to the films. He shouldn't have done some of them, and not from a "hey, these are my movies as much as they are yours" perspective or an entitled "I demand you leave everything I watched as a child as they originally were or else you're History's Greatest Monster" attitude, but because the changes don't work, they look idiotic or they don't make any logical sense either out-of-universe or within it.
Just because you can change something and it's your own creation and right to do so doesn't mean your changes are good ideas.
All of that said: some of George's changes are just damn stupid and insulting to the intelligence of the fans and they're more annoying and distracting than they are supposed improvements to the films. He shouldn't have done some of them, and not from a "hey, these are my movies as much as they are yours" perspective or an entitled "I demand you leave everything I watched as a child as they originally were or else you're History's Greatest Monster" attitude, but because the changes don't work, they look idiotic or they don't make any logical sense either out-of-universe or within it.
Just because you can change something and it's your own creation and right to do so doesn't mean your changes are good ideas.