Material nature provides facility to struggle for vain enjoyment.
The conditioned soul is forced to act under the pressure of the modes of material nature. He has no independence. When he is under the direction of the supreme personality of godhead he is free.
The living entities are not actually meant to be under the control of the modes but when they reject Krishna then they become affected by the three modes of material nature and as a result of that they identify themselves with the material nature.