And even in cases where introducing a bias is desirable, you have to be very careful when doing it. There has been at least one case where introducing a bias towards diversity has caused problems when the algorithm is asked for images of historical people, who were often not diverse at all.
Think of it as a backup for the phone in the case where, say, there’s an adult and a kid in the car, the kid has no phone of their own, and the adult loses consciousness with their phone locked. Or the car is being actively jostled by a group of people (say it drove into the middle of an embryonic riot), causing the passenger to drop their phone, whereupon it slides under the seat. Or the phone just runs out of charge or doesn’t survive getting dropped into the passenger’s triple-extra-large fast-food coffee. It won’t be needed 99% of the time, but the other 1% might save someone’s life, and (presuming the car already has a cell modem it in) the cost of adding the feature should be minimal.