Do you live in Arizona? Are you affected by this in any sense? Why shouldn't the people who live there have the say in it. It's jobs for them, it's their home. The Grand Canyon is thousands of feet deep and hundreds of miles long, it formed millions of years ago. It doesn't need to be "saved" from a tourist attraction that will be a blip on a tiny side of the canyon and an even smaller blip in the history of it. The Grand Canyon is not in any danger.
It's so frustrating to see people who come to places they're not from and protest in fights that they have no stake in, shouting their opinions, generally making everything worse and when the fight is over go on to the next place.
Well, there're plenty of people who frequent this National Park and live in the area who are against the building of this project. It just cheapens the whole place for a handful of jobs (think of the jobs!1). To you it may just be a "blip on a tiny side of the canyon," but to many of us who treasure the place as one of the few great places without giant monuments to human existence, it is an atrocity.
Where I live doesn't matter, as long as I live in the US, because it's a national park. The locals don't get a special stake to it so that they can trash it up as they see fit. Which is a strong argument for national parks in the first place.
It's so frustrating to see people who come to places they're not from and protest in fights that they have no stake in, shouting their opinions, generally making everything worse and when the fight is over go on to the next place.