Why didn't you pick up the child and receive a text message to let him leave school safely?

The reason is usually a measure taken by the school to ensure the safety of students. Under normal circumstances, if parents do not pick up their children at school within the specified time, the school will default that the students have not been picked up. In order to ensure the safety of students, the school will remind parents to pick up their children in time through text messages or telephone calls. If the students are not picked up within the specified time, the school can take other measures, such as arranging students to wait at school and contacting emergency contacts, to ensure the safety of students. Therefore, if parents receive the message of "leaving school safely", it is suggested to pick up their children from school as soon as possible, so as not to bring unnecessary troubles and security risks to their children.