All those who find themselves in our material galaxy came here for one single reason: They desired to experience the same bliss as Krishna, God, the Supreme Person. Thus, they were sent to this material world to be conditioned to varying degrees by material nature.
Do not listen to the demonic disbelievers who claim that the individual spiritual being that each of us is equal to God, the Supreme Person, for therein lies the cause of existence conditioned by material nature. As soon as an individual spiritual being distinct from God forgets its own position and seeks to become One with the Absolute (God), its conditioned existence begins.
Indeed, it is the concept that the Supreme Lord and the spiritual being distinct from God are equal not only qualitatively but also quantitatively that is at the root of conditioned existence. Anyone who forgets the difference between the Supreme Lord and the individual being is subject to the conditions of the material world, which implies that they must abandon one material body to accept another, and die only to die again.
Those who refuse to submit to the Supreme Lord's commands are granted the opportunity to enjoy existence in the material universe. Rather than restraining the conditioned being, the Lord provides them with the opportunity to enjoy life in this world, so that, through experience, they come to understand, after many rebirths or reincarnations, that surrender to God is the sole duty of all beings. Since everything depends on the will of Krishna, God, the Supreme Person, our one and only duty is to surrender to Him and seek His protection.
Embodied souls, who originally belong to the spiritual world, are sent to the material universe because they have become envious of the Lord. But in truth, the primary reason God expelled certain souls from His kingdom is that they rejected the service of love and devotion they owed Him—an eternal duty that all souls perform. Thus, they were immediately plunged into the prison of this material world and forced to accept a physical body.
The degradation of all who dwell in the material cosmos, on any planet whatsoever, stems from their disobedience and their forgetting of their relationship with God. We are all, in truth, the eternal servants of Krishna. Our duty, therefore, is to serve Him with love and devotion. This is the perfection of existence.
In truth, the creation of the material universe is one of the Lord's amusements, for He creates it for His own pleasure, and because it occurs when He so desires. This desire of Krishna, God, the Supreme Person, is also an act of extreme mercy on His part, for He thereby gives souls incarnated and conditioned by matter and illusory energy the opportunity to regain their original consciousness and return to God. Therefore, no one can blame the Supreme Lord for the creation of this material world.