@tntroxxor
What insight? If you're asking about what's going on with their world then I think any explanation is possible at this point. They got high-tech weapon so it could be war; they got monster, alien-like creatures, so maybe alien got something to do with it; they got people with psyche ability inside a confined place so it could be human experimentation; or maybe even all of those together.
I mean, I have read many manga that used mistery stuff like this so I can say these:
Most of the time, the truth doesn't matter, heck sometimes it's so boring it doesn't even compare to the rest of the story. It's all about the journey. The explanation always not far from alien or supernatural beings or time travel shit.
Think about it, the authors make a living by creating stories in a weekly/monthly magazine. They need to stay in the magazine, avoid getting axed. What're the best way to do that? First, they'd think about a goal or a truth about some misteries, then make a starting point, then proceed to fill the middle with intriguing day-to-day stories plus a little hint here and there. No need to racking up your brain over it. It ain't worth it.