I don't think it is too much because in the ****ries where the law is implemented the stealing rate is VERY low compared to those where there is no capital punishment. The Shariah aims to preserve 5 things.
Religion, Life, Intellect, Progeny and Wealth.
Religion: by prescribing death on the one who changes his religion
Life: by prescribing death on the one who kills willfully without reason
Intellect: by prescribing lashing for the one who drinks alcohol and for the one addicted to substance abuse
Progeny: by stoning for the non-virgin adulterer and adulteress.
Wealth: by cutting the hand off the thief.
Allah wants to preserve these matters so severly so the rulings sre severe concerning them.
Ask yourself, if these rulings are put into practice then who would violate these matters?
Then you have to immagine that when a person has his hand cut it will be very difficult for him to work to eat and to do essential things.His life becomes a nightmare. And easily wherever he goes everyone will know that he is or was a theaf. How will he be accepted to work and can he. In this point Islam is certainly not a religion of pardon.
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That's just it!
If the guy had any sense then he'd realise the seriousness of the situation and he would not steal, would he?