Yes. One thing that becomes very obvious if you go along "native" human villages in Africa is the reason civilization develops. When you look at villages that don't grow, but do the normal human thing. Grow, war (2 kinds: young vs old and village/tribe vs village/tribe), grow.

It's not because of agriculture. They have agriculture (they grow maniok, and you don't need much. They have fire, weapons, ... Also the entire countryside is full of grain). It's not that they don't understand how things work. They just don't care.

It's not because they're dumb. In fact on pretty much all measures the humans living in those villages are better, in a genetic sense, than we are. They're smarter. They're more beautiful. Every last one is in shape, even the oldest (the oldest, btw, are maybe 45, not that they even know themselves. In both villages I saw the oldest was a couple). They're even better, genetically, than the black people living in cities around them. They have no sick (maybe 1), because the sick are dead. Even sick children regularly die. They bury their dead, with respect, after a burial but to say they have a religion is overstating matters. They have noone that can't run a marathon, or is fat, or ... because if you can't hunt you don't eat. Wounds are deadly. Not because the wound is so serious, but because you're nearly guaranteed to develop fever and die. Most people die from complications with infections. They have only beautiful men and women, because if you can't participate in "evening activities" you'll go hungry or get murdered (and it's not just men: women have lovers kill other men due to "insults", or they poison someone. And regularly it doesn't take much incentive at all for a murder to happen). Sometimes they (try to) treat cities the way the treat neighboring tribes: they attack them to kill everyone (at the very least all men). That usually fails due to guns, but it's not like it never works.

There are very few people in those villages that want to leave. And they're not about to starve. There's no need for civilization, and, frankly, they don't want to. But also, I don't care what religion or non-religion you have: you will find that way of live thoroughly immoral.

Great point until the end. None of your descriptions imply a lack of morality for living isolated from a greater civilization. If anything, such small societies inhabit a neutral position, in that they don't care, which is something you already stated.

I think the only people arguing that the North Sentinelese are immoral are religious, for instance (hence why most attempts to visit are done by missions). The general consensus is otherwise awe for being separated from the rest of us, relatively unmolested.