I do mountain bike patrol in a smallish/medium sized city. Was just riding one morning just after rush hour and spotted a little kid probably 3-4 years old standing on the side of the road with no parents in sight. Stopped and asked him where his parents were and he just kinda shrugged. Called it in and some dude ran out of some townhomes across the street and said the little dude was standing out there for a few hours and he was watching him to "keep an eye on him." There were people around and everything, but we never got a call for it.
Long story short, he wandered out of the room him and his mom were staying in nearby and wandered out to the street. Place was a shelter for women and he was able to get out past the manager and a court police officer. Mom had died from a heroin overdose 3 days prior and when the little guy got hungry he got out of the room and wandered out to the street. No one even went to check on her either despite the smell.