Well, if my fiance had no choice but to love me, it wouldn’t feel very special. If she only chose to be with me after experiencing the benefits of my wealth and power, it wouldn’t feel very special either. Maybe we have freewill because God likes when people choose to love Him just like we do. After all He made us in His image.
Also, suffering is only an opportunity to grow closer to God. When we are suffering, it is easiest to remember to pray. Jesus suffered for us, so why not suffer for Him? There is always some good to find out of suffering too. The Holocaust helped unite most of the world, and the victims may be in paradise now.