To your point we literally don’t see the same things. Humans only “see” a tiny thumbnail of the world at a time even that is a blurry recreation of what reality is actually doing or happening in front of you.

It’s filling in the gaps in real time by old memories and splotched together assumptions. Now add to that other humans together in a group. You’re gonna eventually agree on a reality that you can communicate about and make decisions etc.

The internet has inserted itself in the evolutionary path of humans and inadvertently all life forms on earth. It’s like an alien entity that controls human minds like a fungus would.