Killing a Person is One of the Greatest Sins Related in the Qur'an
Killing a person for no reason is one of the greatest sins related in the Qur'an:
... if someone kills another person – unless it is in retaliation for someone else or for causing corruption in the earth – it is as if he had murdered all mankind. And if anyone gives life to another person, it is as if he had given life to all mankind. … (Qur'an, 5:32)
... those who do not call on any other deity together with God and do not kill anyone God has made inviolate, except with the right to do so, and do not fornicate; anyone who does that will receive an evil punishment. (Qur'an, 25:68)
As the verses suggest, a person who kills innocent people for no reason is threatened with a great torment. God informs us that killing even a single person is as evil as murdering all mankind on earth. A person who observes God's limits can do no harm to a single human, let alone massacre thousands of innocent people.
All of this shows that the morality that Islam recommends to mankind brings to the world the virtues of peace, harmony and justice. The horror known as terrorism, that is so preoccupying the world at present, is the work of ignorant and fanatical people, completely estranged from Qur'anic morality, and who have absolutely nothing to do with religion. The solution to these people and groups who try to carry out their savagery under the mask of religion is the teaching of true Qur'anic morality. In other words, demonstrating to them the errors of their bigotry, causing them to completely abandon it; explaining Islam based on the Qur'an will fundamentally destroy the ideology of terrorism and terrorists and therefore is the only solution to save the world from the nightmare of terrorism.