#Answer to a question

*You compare internal unrest of a criminal -if it was present- to the physical,psychological and social damage he caused to a person , to a family or perhaps a whole country!!!
Where is fairness here?!

*God Almighty has the ultimate perfection and the best attributes.
He describes Himself as the Best of Judges in the Quran ; and commands Justice ,being just and dealing justly .
God Almighty declares in the Quran:
(translation of meaning)

“God commands justice and fair dealing...” (Quran 16:90)

And in another passage:

“O you who believe, be upright for God, and (be) bearers of witness with justice!...” (Quran 5:8)

“We sent Our Messengers with clear signs and sent down with them the Book and the Measure in order to establish justice among the people…” (Quran 57:25)

*Yes we commit sins but Islam teaches us that human beings are born without sin and are naturally inclined to worship God alone (without any intermediaries). To retain this state of sinlessness humankind must only follow God’s commandments and strive to live a righteous life. If one falls into sin, all that is required is sincere repentance followed by seeking God’s forgiveness. When a person sins he or she pushes themselves away from the mercy of God, however sincere repentance brings a person back to God.

Islam teaches us that God is the most forgiving, and will go on forgiving, repeatedly. Part of being human is making mistakes. Sometimes the mistakes are made without deliberation or a bad intention, but sometimes we knowingly and deliberately sin and do wrong to others. Therefore as human beings, we are constantly in need of forgiveness.

*The life of this world is fraught with trials and tribulations, however God did not abandon humankind to these tests. God equipped humankind with an intellect and the ability to make choices and decisions. God also gave us words of guidance. As our creator, He is well aware of our nature and eager to guide us on the straight path that leads to eternal bliss.

God Almighty, the Most Merciful won't leave us to guess & figure out what pleases Him. The only One who can surely say what pleases the Creator is the Creator !
God says:(translation of meaning)
"His is the creation and His is the command." (Quran 7:54)
Here comes the role of the specially chosen trustworthy messengers to deliver His message .
(Suppose revelation was to each and every person; we would get different claims from different people.
The message has to be through a special trustworthy person , and should be available for everyone to examine)

*But please don't say that hallucinogens are messengers!
God Almighty gave us the blessings to take care of them and use them in the way that pleases Him.
Stimulating your neurons with drugs , altering your perception does not bring you close to your Creator ; it could bring some temporary pleasure and different sensations to you but that doesn't mean that your Creator is pleased .
The Quran is God’s final revelation and it is applicable for all of humankind; all people, all places, all times. Throughout the Quran God continually asks us to turn to Him in repentance and ask for His forgiveness. This is the road to salvation. This is our rescue from destruction.

“And whoever does evil or wrongs himself but afterwards seeks God's forgiveness, he will find God Oft Forgiving, Most Merciful.” (Quran 4:10)

“Say: ‘O My slaves who have transgressed against themselves (by committing evil deeds and sins)! Despair not of the Mercy of God, indeed God forgives all sins. Truly, He is Oft-Forgiving, Most Merciful.’” (Quran 39:53)

Quran is not only a book of guidance, it is a book of hope. In it God’s love, mercy, and forgiveness are obvious and thus humankind is reminded not to give in to despair. No matter what sins a person may have committed if he resolutely turns to God, seeking forgiveness his salvation is assured.
I would appreciate if you listen to this 'sura' (chapter) of the Quran

http://en.islamway.net/recitation/45981/surat-al-mulk-dominion