Only if you don't care about them.
Blame smart phones and social media. As soon as the car stops, the driver reaches for their addiction device, to check if they’ve gotten any messages. So distracted, they walk off without their child. Heaven forbid, somebody should go for more than a few minutes without checking FB, Instagram, or Twitter. Or making sure nobody texted them. Just have to check one last time before starting work. You never know, somebody could post a ubiquitous cat photo that must be viewed immediately or dire things might happen.
I sat near a young couple at a play recently. As they sounded the bell for everyone to take their seats, the woman told the man she was going to silence her phone. He about hyperventilated. He was asking if she was sure she wanted to do that, what if there was an emergency, what if somebody needed to get in touch, or had something important. Mind you, she didn’t say turn the thing off. Just silence it.