* Safety: Keeping the door open allows adults to keep an eye on children and ensure their safety. This is especially important in dangerous areas, such as kitchens or swimming pools.
* Communication: Keeping the door open allows for easy communication between adults and children. This is important for ensuring that children are able to get the help they need when they need it.
* Trust: Keeping the door open can help to build trust between adults and children. This is because it shows that adults are not trying to hide anything from children and are always available to them.
Ultimately, the author's emphasis on the importance of not closing the door behind children is likely based on a combination of these factors. By keeping the door open, adults can help to ensure the safety, communication, and trust between themselves and the children in their care.