We also have unprecedented population density. 10,000 years ago I wouldn’t have walked within sneezing distance of 1,000 people before lunchtime. Just because

We also have unprecedented population density. 10,000 years ago I wouldn’t have walked within sneezing distance of 1,000 people before lunchtime. Just because something wasn’t needed before doesn’t mean it isn’t needed now that circumstances have changed. We also existed for hundreds of thousands of years without seatbelts.