There’s always blind spots. We can look in mirrors, turn our heads to look behind us. People can still dart behind cars that are clearly backing out.
Where I teach, parents park in the teachers’ parking lot all the time even though they have their own parking and child pickup locations. Kids run through the parking lot without a care in the world. Adults are looking at their phones instead of paying attention. I try to arrive before kids come to school and leave well after they leave. However, if I have a meeting across the city and have to leave on time, I am forced to deal with the anarchy and chaos of my parking lot. I constantly stressed about running over a child. So, when I bought my car two years ago, I got the rear view camera and the sensors that beep if anyone is behind my car. I love it and highly recommend it. I still turn around and look, but having the extra technology gives me peace of mind.