"Philosopher-Kings" as "Guardians"

Plato’s ideas about how to best raise the “Guardians” confuse me. What is the point of keeping them from having a family life, for example? How would that help them to become all truth loving and wise? Isn’t it possible that by trying to keep them from knowing love could in some way inhibit them? I can understand why he thinks a lot of personal property and material things might get in the way of becoming all-wise, but how can love? The strangest part of all this isn't that Guardians can't have children, but that they can't have contact with them. The Guardians who are "suitable" for breeding should be organized into "mating rituals", where children are conceived. Then, these children are communally brought up by nurses. The children should not be able to recognize their parents, and the parents should not be able to recognize his or her child. Plato completely defies the very real, psychological need for the bonds between children and parents. That is not only unreasonable and unnatural, but would also severely hurt the child and parents. To keep someone from having a family life at all would be unnatural, and it just doesn't make sense. I see no correlation between being able to fall in love or have a family with the ultimate demise of the "Philosopher-Kings" turned "Guardians". The ability to love and be loved would not impair their ability to find truth and wisdom in their lives.