We all exist as one unified, giant system of souls. If some of the souls advance out of their own free choice, then so does the whole system.
If some parts of the system have received an opportunity to choose freely, but aren’t using it, then they are cut off from actively participating in the system. The system of souls is a living organism where changes are taking place non-stop, depending on how the souls in it rise and descend, realize their freedom of choice or not. They cause changes in all the souls and determine how the entire system will advance to the final, corrected state.
By neglecting to use one’s freedom of choice, a person rejects the Creator’s personal governance over him and shifts to a path of suffering. He then accumulates suffering until reaching a sufficient realization of evil, which makes him worthy of receiving freedom of choice once again, and this time using it.