Hawaii

The TMT is to be built on already set aside astronomy preserve, set aside decades ago. The reason this was done is because the Mauna Kea summit is the most exquisite site in the Northern Hemisphere for visual astronomy.

Then there's the fact that the Mauna Kea summit is huge -- a mountain much larger than Everest, of which the astronomy preserve is a rather small part (contrary to what the article in the OP states -- facts matter, damn it!).

Finally, one of the objections, possibly the main one, is that building such a telescope up there disrespects native heritage and culture. This boggles my mind because there would be no native culture on Hawaii if it weren't for their ancestors traversing the Pacific in canoes by navigating by the fucking stars!

Build the TMT!