Your argument absolutely has merit. However the opposite is that there might be people there who are aware there’s maybe way more to their small world, and want nothing more than to see it.
I care more about the latter, but mainly because that’s how I would think. If we found out there’s an alien superhighway passing over earth hidden from us, and they’re keeping us “protected” and not allowing contact, I’d be very pissed off. I immediately would want to leave, meet the aliens, learn their ways and knowledge, etc…
Just sayin’, it can go both ways. Ya never know if you don’t talk to them.
Also, it seems kind of morbid and archaic in a way, keeping them protected. Not like a zoo by any means, but still. If we knew for certain they all wanted to be left alone, that’d be better.
Who’s paying for this?