In truth, the crime committed by a murderer weighs heavily on his existence and future, which is why, according to the Manu-samhita, he must be killed. By putting a murderer to death, the government and the justice system show mercy to him, for if the murderer is not killed in his current life, he will have to be killed in future lives, and thus suffer several times instead of just once.
Since people do not know that there is a future life, that reincarnation is a reality, and are also unaware of the complex workings of nature, they invent their own laws and reject the divine laws that govern this life and their existence. He who commits murder and hides it, believing that he can get away with it, is an idiot, for he does not know that while he can hide things from men, it is impossible for God, for He already knows everything. The law of karma will apply, and in his future life he will in turn be murdered and will experience the resulting suffering. This will happen several times instead of just once. It is through suffering that we erase our faults, so let us not sin again and harm anyone, whether human, animal or plant.
These four root causes lead the soul to suffering and material slavery.
Forgetfulness occurs at the moment of death. The soul, enclosed in its ethereal body, is transported by Lord Krishna's attendants to the womb of a new mother, who will then give it a new material body. It is the material body that plunges the incarnate spiritual being into forgetfulness of everything: of God, of their previous life, of their true identity, of real existence... This forgetfulness is accentuated by the external energy or material energy of the Lord in His material nature, which influences the incarnate being through its attributes and modes of influence: virtue, passion, and ignorance. In reality, death is synonymous with forgetfulness.
The second source is the false ego or material ego. The false ego is the force that chains the incarnate being to material existence. This force, which drives the incarnate being to identify with his body and to seek to dominate matter, is at the origin of the being's conditioning to matter.
The three forms of the false ego are: domination of material nature, identification with one's body, and the hoarding of all material possessions. The primary function of the false ego is to plunge the being into ignorance and foster atheism.
Three gates open to hell: lust, anger, and greed. Let every sane person close them, for they lead the soul to its destruction. These are the origins of demonic life.
Man seeks to satisfy his lust; if he fails to do so, then anger and greed arise. Therefore, a sane person who does not want to fall into demonic forms must try to rid himself of these three enemies capable of “killing” and suffocating the soul, to the point of depriving it of any chance of freeing itself from the traps of material existence.