1. Not enough context — 8 billion people = infinite drama feed with no block button. You'd know everyone's ex's name, their weird uncle, and that time they cried in the bathroom at work. Instant mental DDoS.
2. Dunbar's number is real — science says humans can only maintain deep, meaningful relationships with 150 people max (the classic limit from Robin Dunbar's research on social group sizes in primates/humans). Beyond that it's acquaintances (500), beyond ~1500 it's just names/faces. "Truly caring" about thousands? Brain hardware literally can't do it. Everyone else becomes background noise.
3. We'd 100% kill way more people if we truly knew them — right now most folks are filtered through polite distance, social media highlights, and "don't ask don't tell." Remove the filter? You see the cheating, the backstabbing, the cruelty to animals, the secret kinks, the grudges, the lies they tell their kids. Proximity + knowledge = contempt on steroids. The murder rate would go parabolic. We'd all end up with 150 ride-or-dies and a lot of shallow graves.