One of the things that people should learn when it comes to studying driving is never to use your rear view mirror when you back up. It is good to use it as a reference when perhaps you want to know if there is a car or something behind you. But that is only a glance as much as possible. It is best to look at your rear windshield and see if you are truly clear to back up. A lot of accidents happen that way.
A clear sign of people who use rear view mirrors to back up would be to look at the rear end of the car. Normally, you will find busted or cracked taillights or dented trunks and bumpers. Small as they may seem, they are signs that the person driving the car is prone to this minor yet critical mistake. There are things that your rear view mirror does not show you and at times the small space can lead to irresponsible driving.
The same goes with side view mirrors. Most of the cars today come with larger ones but similar to rear view mirrors, they are just guides to help you. Miscalculations often occur if you rely heavily on these mirrors. The best way is still to really look and know how you are backing up your car. Be wiser and care more for your car. Outside the potential accidents, you are slowly deteriorating your car and not improving your basic driving skills.