The horse is the vehicle for your journey. But, while using the horse, whether you travel to a forest to be robbed by thieves or travel to the house of a friend in the city depends upon the direction of your free will. If you go to a forest, you are robbed. If you go the city, you are honored by your friend. The horse is one and the same for both purposes. But, the resulting directions ending in different fruits are based on your psychology developed due to your freedom of will.
This freedom is given to all souls and each soul develops its own direction based on the freedom of will given by God to the souls in this world. This world is called as karma loka or world of doing actions as per the freedom of the will of a soul (svabhaavastu pravartate… Gita). The upper worlds like hell and heaven are called as bhoga lokas or places for enjoying the fruits of past deeds without any freedom of the will.
You cannot blame God for giving such free will to souls in this world because due to this free will, all souls are not spoiled. In spite of this freedom of will, there are several souls, which are benefited much. If you remove this freedom of will from this world, there is no real enjoyment of the fruits resulting from actions based on free will. This creation is not only created by God for His entertainment, but also for the entertainment of souls.
Hence, the present system of actions yielding corresponding fruits (there is no freedom for you to change the fruit of a specific action) having freedom in selecting a specific action is a mixture of hot and sweet for entertainment.
If you put your finger in fire, it will burn. If you put your finger in cold water, it will be cool. There is no freedom for you to change the specific fruit of a specific action. But, there is full freedom for you to put your finger in fire or water. If this freedom is also absent, the souls become inert robots only. In such case, God has to enjoy the good or bad fruits of all actions. In the present system, God does not enjoy the fruit of any action done by you. God is completely free from the blame since He propagated the right knowledge of fire and water from the beginning of the creation.