On average, backover car accidents kill some 230 people a year, mostly children and mostly in accidents in which a parent or another relative is driving, writes the New York Times in an Editorial. Another 18,000 people are injured annually in backover accidents. Yet the Obama administration has balked at carrying out a law that requires rearview technology in new cars…. One reason the industry doesn’t want mandatory rearview cameras is that it makes more money selling them as options. The added cost to a car is small — $160 to $200, according to a government estimate from 2010 — and that is surely too high now, given the technology’s declining cost.