Some personalities incarnate simply to experience the birth process, which cannot be experienced in nonphysical reality, and that’s all they want, with no intent on having a full human experience. Some incarnate and immediately dislike the human experience, so they leave.

Others enter into agreements within their collective to be mother and daughter, father and son, etc., to help that personality experience an intense range of feelings and emotions. There can be many reasons why someone chooses to die young, but in the case of physical death, it’s never an unscheduled event or accident.