While the Trump administration has generally taken an anti-regulatory view, the obvious alternative — allowing car makers simply to offer rear seat reminders as an option — is unlikely to prove effective. Few, if any, parents believe themselves capable of leaving a young child alone in a hot car. There's simply not going to be a rush by consumers to seek out this particular safety feature. Like seat belts, air bags and other helpful safety technology, it's far better for the federal government to ultimately mandate its installation and use. The cost is likely to be modest, but the benefits, potentially hundreds of lives saved, is enormous — if not necessarily obvious to adults who would never dream of leaving a child unattended.