How is a toddler going to get behind my car before I can get in it that I did not notice was nearby and start visually tracking from standing there? How is a backup camera going to help when I backed into the spot and am now pulling out forwards? That’s just not a realistic concern. Also, backup cameras cannot see much closer to the wheel than those cars I mentioned with good visibility.

Tech really won’t help you here- safe driving requires looking where your vehicle is going with your own eyes. The field of view of a backup camera is insufficient- even if you have one, it’s usually better to be looking directly behind you and not use it. I see cars with backup cameras and sonar hit each other in parking lots all the time, because they thought the camera was a replacement for looking and situational awareness.

No backup camera will let you observe the nail the wind blew close to your tire to puncture it soon as you move the car. Perhaps it is best if I just stay home.