Well . . . I was born and raised and live within 40 miles of the TMT's site and know the area well.
It's a real mess. Neither the TMT nor the observatories already up there are hurting the environment in any way. Last spring a huge quantity of misinformation went out -- all has been thoroughly debunked, especially the indigenous species argument and the water table/aquifer argument. Absolutely nothing to them.
There is no single set of opponents. Instead, many groups are piggybacking their complaints and strategies onto the TMT issue. In my experience (I know some of the protesters personally) it's mainly all about Hawaiian Kingdom issues -- the environmental and economic issues are cover for that.
There's so much misinformation that no single post I write can cover it. Here's a sample of reasons given for opposing the TMT: "star wars," it's a weapon in fact; it's a profit-making venture, it's not needed because we have Hubble; all the telescopes are doing the same work with the same equipment so why do we need another; there's no point to trying to understand the universe and perhaps its origin because, hey, our myths explain that perfectly well, and on and on and on.
There's constant talk about "sacred," which to me is the kind of thing that Samuel Johnson (or someone) said about patriotism: it's the last refuge of a scoundrel. Yes, the mountain is believed to be sacred by some number of native Hawaiians. That's certainly true. It's also certainly true that it's only since the TMT thing blew up (remember, it's been in the making for a decade) earlier this year that there were actually people wanting to go to the summit and pray. Otherwise . . . not in the past. It's political praying, in my opinion. And BTW, I'm an anthropologist.
The anti forces are complately anti-science -- don't take my word for it; go look at their sites. When one of the main guys was asked to respond to all the hydrologists who say there's no chance of acquifer pollution, he said that the scientists were stupid and knew nothing. (BTW the supposed risk to the aquifer is from a 5,000 gallon holding tank that will have sewage and misc. chemicals in it and is meant to be pumped out routinely.) The guy speaking has a high school education, so far as I know.
The protesters I know do not actually know the mountain itself. They know the road to a visitor's center and to the summit. They are not involved in the many, many volunteer and state and county projects such as reforestion and habitat work, the removal of invasive species, and so on. They don't appear to care about that at all.
At one point, a couple of years ago, in a court case that the TMT won, the opponents asked the judge if they could swear in a little girl, because a mountain spirit spoke only through her. The judge refused, saying that he didn't exactly know how to swear in a spirit. That's typical. Can't have the TMT because some spirit says no.
Why want it? Jobs are part of it, but also you have to realize that the Big Island is a serious backwater. When I was growing up, in the 1950s, every smart or ambitious kid who could get the hell out did, because there was just nothing here. I got out and didn't come back for nearly 50 years. The school system is terrible; the TMT is going to pour well over $1M into the system each year. The astronomy community is upping its outreach game, hoping to identify the smart kids who can go far, and helping them. And of course trying to raise the general level of the educational system.
For me -- beyond all the things I've written, I like it that my island is home to some things that are totally world-class. Outside of astronomy and volcanoes, that's about it for us. We haven't got a lot here.
Finally, what happed this week was very specific: the Supreme Court held that the DLNR (Dep't Lands and Natural Resources) should not have issued the final permit while there was still a contested case pending. OK, so now we wait for the outcome of the contested case. And then they can issue the permit. Indeed DLNR should not have done that, but hey -- in Hawai'i we follow the "ready, shoot, aim" pattern more than we should.
It's worth nothing that the opponents have not won a single legal victory before this one, and this is a very, very limited victory.
Anyway. I'll stop.