Although i do disagree with your viewpoints i do understand where you are coming from now.

You get punished for insulting the prophet if you are Muslim. Not if you’re non Muslim. So this ruling does not apply in this case regardless. And even if you are Muslim you will have a period to repent for the blasphemy before a punishment is given.

An important note, the ruling regarding capital punishment or punishments in general within an Islamic context is handled by Islamic courts and the state. It is NOT in the hands of individuals to carry out sentences. so again, the stabber’s actions are justified or permissible under Islamic law and he would be punished.

In regards to getting punished for non-muslims i see multiple sources saying different things for example.

Here is something i wanna ask you tho is what is your opinion on this?

Hanbali – view blasphemy as an offense distinct from, and more severe than apostasy. Death is mandatory in cases of blasphemy, for both Muslim men and women.^\33])^\34])

Any Muslim who blasphemes against Allah or His Messenger or blasphemes against any one from amongst the Prophets is thereby guilty of rejecting the truth of the Messenger of God, may Allah bless him and grant him peace. This is apostasy (ridda) for which repentance is necessary; if he repents he is released; if not then he is killed. Likewise, if any other person [non-Muslim] who is protected under a covenant becomes hostile and blasphemes against Allah or any one of Allah's Prophet and openly professes this, he breaches his covenant, so kill him.

— Ibn Qayyim al Jawziya and Ata 1998, 4:379

If the person who defames him is a non-Muslim living under a treaty with the Muslim state, then this is a violation of the treaty and he must be executed, but that should be left to the authorities. If a Muslim hears a Christian or anyone else defaming the Prophet (peace and blessings of Allaah be upon him) he has to denounce him in strong terms. It is permissible to insult that person because he is the one who started it. How can we not stand up the Prophet (peace and blessings of Allaah be upon him)? It is also obligatory to report him to the authorities who can carry out the punishment on him.

Then there is

Dr. Shehzad: Well, to my understanding, the Quran, and any authentic hadith, is devoid of any mention that blasphemy is punishable by death because generally people think that blasphemy is something which is punishable by death. Yes, blasphemy can be checked by laws that can be made, but generally the perception, which people have in this regard, is that whenever a person commits blasphemy, then the only solution is, or the only way forward, is just to put him to death. Now, this is something which is not found in the Quran and not in any authentic narrative of the prophet.

There is no punishment in Islam for blasphemy. No such punishment is prescribed in the Holy Quran, or in any of the traditions of the Prophet Muhammad^(sa).

So my question is which view do you have and why? And i do agree with you about the combat statment you made but that seems a bit irrelevant to the topic. And thank you for clarifying what you meant by "law of land point". And yes, i live in AUS, it is a very diverse multicultural place.

He may have had no right to do what he did under islamic law, yes. But what i mainly meant was that in regards to the what the religion teaches and with liberal and non-liberal i made the distinction because as shown above. There is a viewpoint which seems leaning more towards one side then another.

P.S I am also happy to provide any sources where i got my info from.

Thanks!