Well this is a complex and personal subject to understand in the first place let alone speak about But my take on it would be, we are only reborn to fill a hole in the hive. We all are born with roles to fulfil, and once that is done or we are bodily worn out to continue that task, we cease to exist and someone else comes in and replaces us I like to compare the hive consciousness in bees to our very own consciousnesses, both gives meaning to and takes meaning away from life, doesn’t it?