Semi drivers require a commercial license, and special training. They’re monitored way more closely than your average American driver.

And side mirrors only let you see what’s behind the car to the sides and at a distance, not what’s immediately behind the car. I don’t want some idiot in his $80K battering ram to roll over me because I happened to walk behind his death trap and he couldn’t be bothered to wait for the rear view camera to come up.

Not being able to see what’s immediately behind the vehicle is a safety hazard, especially in suburban areas or parking lots where most people are reversing out of a space with other people walking around.