We observe that for the purpose of protecting the body...
We observe that for the purpose of protecting the body, the diseased part of the body is amputated; or for ensuring the growth of a plant, harmful and inconveniencing branches are sawed away.
Those, who regard the killing of the murderer as being a loss of another individual, only visualize it from an individual perspective; however if they were to take the welfare of the entire society into consideration and were to know what role the implementation of qisas plays in safeguarding and educating all the other individuals, they would surely review their words.
Eliminating such blood-shedding individuals from the society is akin to severing a harmful limb or a branch, which, as per the ruling of reason, must necessarily be severed. And indeed, it must be realized that until today, no one has ever objected to the amputation of a diseased limb or detrimental branch. This was in connection with the first objection.
With respect to the second objection, it must be realized that fundamentally, the legislation of qisas is in no way related to the issue of vengefulness. This is because vengeance means smothering the flames of anger arising due to a personal issue. On the other hand, qisas has been decreed for preventing a repetition of oppression within the society and with the objective of seeking seek justice for the other innocent individuals of it.
As for the third objection that the killer must necessarily be suffering from a psychological disorder and that it is not possible for such a crime to be perpetrated on the part of normal individuals, it must be said that this speech is true in certain instances and Islam too, in such instances, has not imposed the ruling of qisas for an insane killer or the like.
However, the sickness of the killer cannot be provided as an excuse since the evils that this would unleash and the audacity that it would impart to offenders is evident for one and all. And if this argument is true in the case of killers, it should also be true for all the criminals, offenders and those who violate the rights of others. This is because a person possessing a complete soundness of intellect shall never encroach upon the rights of others.
Accordingly, all penal laws should be annulled and all offenders should be dispatched to hospitals housing psychologically-diseased patients instead of prisons.