I'm not sure about the why either, but apparently someone in Hollywood thinks that people want to see a Ghost in the Shell live action movie.But who cares about Ghost in the Shell at this point? Maybe if this was the late 90s, but now the franchise is basically irrelevant in American culture.
They could just call the movie Cyber Cops or something and do just as well, without annoying the one fanbase that would actually care about GitS and without having to pay any licensing fees either.
In Japan they made a remake of Eastwood's Unforgiven. I have no idea what demographic that movie had in mind either