There is such a land that is governed by kuffar rulers and kuffar rules, that's WHY ISLAM QA SAY YOU CAN'T CARRY OUT PUNISHMENTS IN THOSE LANDS PLEASE READ WHAT THE SCHOLARS YOU'RE QUOTING FROM SAY ABOUT CARRYING OUT PUNIHSMENTS.
Assalaamu alaykum wa rahmatullaahi wa barakaatuhu,
Akhi "quranalim" without a doubt the rulings are clear regarding an individual be it Muslim or non-Muslim who slanders and speaks ill of the Prophet pbuh that he should be killed. Alhamdulillah. But to take that hadd punishments legislated in sharee'ah are to be applied in lands of kufr is not from among the scholarly opinions we have found. You have, alhamdulillah quoted from the very beneficial site Islam Q&A in referring to the ahaadeeth proving this however failed to address the issue of the following:
1. Who applies the hadd punishment?
2. What about when the act is carried out in a land that is not governed by sharee'ah?
I believe the following link from the same website addresses adequately both of these points alhamdulillah.
If a person commits a crime which deserves a hadd punishment in a land that is not ruled according to that which Allaah has revealed, what is to be done?
If a Muslim commits a crime which deserves a hadd punishment, such as zina (adultery), and he wants to purify himself by having the hadd punishment carried out on him, but his government does not rule according to that which Allaah has revealed, what should he do? If he asks some of his relatives or friends to carry out the hadd punishment on him, is that correct, and will his sins be forgiven?.
Praise be to Allaah.
The scholars are unanimously agreed that the hadd punishment can only be carried out by the imam (Islamic ruler) or his deputy. This is in the people’s interests and is for the protection of their soul, their wealth and their honour. The imam is able to carry it out because of the power and authority he has, which make the people obey him, and because no one can accuse the imam of being biased or negligent in carrying out the hadd punishments. Thus the imam is able to carry out the hudood punishments in the proper manner so that the shar’i goals will certainly be achieved.
Al-Mawsoo’ah al-Fiqhiyyah, 17/145.
It says in Fataawa al-Lajnah al-Daa’imah, 7/21:
The hadd punishments can only be carried out by a Muslim ruler or one who takes the place of the ruler. It is not permissible for individual Muslims to carry out the hadd punishments because of the chaos and fitnah (tribulation) to which that will lead.”
It also says (21/5-6):
No one can carry out the hadd punishments except the Muslim ruler or his deputy, in order to maintain order and prevent anyone from transgressing against others, and to protect against injustice. And the sinner has to pray for forgiveness and repent to Allaah and do a lot of good deeds. If he is sincere in his repentance towards Allaah, Allaah will accept his repentance and forgive Him by His grace and kindness. Allaah says (interpretation of the meaning):
“And those who invoke not any other ilaah (god) along with Allaah, nor kill such person as Allaah has forbidden, except for just cause, nor commit illegal sexual intercourse and whoever does this shall receive the punishment.
69. The torment will be doubled to him on the Day of Resurrection, and he will abide therein in disgrace;
70. Except those who repent and believe (in Islamic Monotheism), and do righteous deeds; for those, Allaah will change their sins into good deeds, and Allaah is Oft‑Forgiving, Most Merciful”
“And verily, I am indeed forgiving to him who repents, believes (in My Oneness, and associates none in worship with Me) and does righteous good deeds, and then remains constant in doing them (till his death)”
And the Prophet (peace and blessings of Allaah be upon him) said: “Islam erases whatever came before it, and repentance erases whatever came before it.”.