Sigh......ok here is the full explanation since you won't read the fatwa in the link provided.
The Muslim is obliged to defend himself and his family from any aggressor. He should ward him off with the slightest means, but if the assailant cannot be warded off except by killing, then it is permissible for the one who is being attacked to kill him, and he is not subject to retaliation (qisaas) and he does not have to pay any blood money (diyah) or offer any expiation (kafaarah), because shareeah has given him permission to kill in this case, and the slain aggressor is threatened with Hell, whereas the victim of aggression, if he is killed, is a martyr (shaheed) in sha Allaah. It makes no difference whether the aggressor is a Muslim or a kaafir.
It was narrated that Abu Hurayrah (may Allaah be pleased with him) said: A man came to the Messenger of Allaah (peace and blessings of Allaah be upon him) and said: O Messenger of Allaah, what do you think if a man comes wanting to take my property? He said: Do not give him your property. He said: What if he fights me? He said: Fight him. He said: What if he kills me? He said: Then you will be a martyr. He said: What if I kill him? He said: He will be in Hell. Narrated by Muslim (140).
It was narrated that Saeed ibn Zayd (may Allaah be pleased with him) said: The Messenger of Allaah (peace and blessings of Allaah be upon him) said: The one who is killed defending his wealth is a martyr, the one who is killed defending his family is a martyr, the one who is killed defending his religion is a martyr, and the one who is killed defending his life is a martyr. Narrated by al-Tirmidhi (1421), al-Nasaai (4095), Abu Dawood (4772); classed as saheeh by al-Albaani in Irwa al-Ghaleel (708).
Shaykh al-Islam Ibn Taymiyah (may Allaah have mercy on him) said:
The Sunnah and scholarly consensus are agreed that if a Muslim assailant cannot be warded off except by killing him, then he may be killed, even if the wealth that he wants to take is a small amount, as the Prophet (peace and blessings of Allaah be upon him) said in the saheeh hadeeth: The one who is killed defending his wealth is a martyr, the one who is killed defending his life is a martyr, and the one who is killed defending his womenfolk is a martyr Fighting off an assailant is established in the Sunnah and by scholarly consensus. End quote.
Majmoo al-Fataawa (28/540, 541).
In al-Rawd al-Murabbi (p. 677) it says:
If a person or one of his womenfolk, such as his mother, daughter, sister or wife, is attacked, or his property, whether a slave or an animal, is attacked, then he has the right to defend that by the least means that he thinks will ward off the attack. If he is able to ward it off with the least means then it is haraam for him to do more than that because there is no need for it.
If he cannot ward off the attacker except by killing him, then he may do that, i.e., kill the assailant, and he is not liable for that, because he killed him to ward off his evil. End quote.
Shaykh Saalih al-Fawzaan (may Allaah preserve him) said:
The one who is attacked by someone who wants to kill him or attack his womenfolk such as his mother, daughter, sister or wife and violate their honour, or is attacked by someone who wants to take or destroy his property, has the right to defend himself against that, whether the attacker is a human or an animal. He should ward it off with the least that he thinks most likely will be able to ward it off, because if he is not allowed to defend himself that will lead to destruction and harm against himself or his womenfolk or his wealth, and because if he did not do that, people would overpower one another. If he cannot ward off the assailant except by killing him, then he has the right to do that, and he is not liable, because he killed him in order to ward off his evil. If the victim is killed then he is a martyr because the Prophet (peace and blessings of Allaah be upon him) said: If a persons wealth is sought unlawfully and he fights and is killed, then he is a martyr. Narrated by Muslim and others from Abu Hurayrah (may Allaah be pleased with him). And he said: A man came and said: O Messenger of Allaah, what do you think if a man comes wanting to take my property? and he narrated the hadeeth quoted above.
Al-Mulakhkhas al-Fiqhi (2/443).
The person who is attacked should not hasten to kill the assailant until after he has exhausted other means of warding him off, such as reminding him of Allaah, scaring him and threatening him, seeking help from other people, or seeking the help of the police. But he may hasten to kill him if he fears that the aggressor is about to kill him.
It was narrated from Qaboos ibn Mukhaariq that his father said: A man came to the Messenger of Allaah (peace and blessings of Allaah be upon him) and said: What if a man comes to me wanting to take my wealth? He said: Remind him of Allaah. He said: What is he pays no heed? He said: Seek help against him from those who are around you of the Muslims. He said: What if there are no Muslims around me? He said: Then seek help against him from the ruler. He said: What if the ruler is faraway from me? He said: Then fight him to defend your wealth, until you become one of the martyrs in the Hereafter or you protect your wealth. Narrated by al-Nasaai (4081) and classed as saheeh by al-Albaani in Saheeh al-Nasaai.
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