You don't consider Blasphemy of prophet as Fasad Fil Arz?. I consider it. Now negate my point using exact words of Quran?
Bro, if you are interested in serious and productive debates/arguments, then you need to learn the basics first. You are the one taking an affirmative position (i.e. you are claiming that Blasphemy is Fasad fil Arz) so the burden of proof lies on you ... Please quote any Quranic verse (or even Sahih Hadith) which says that "Blasphemy is Fasad fil Arz"
Why do I NOT consider Blasphemy itself as Fasad fil Arz ?
Simply because Fasad fil Arz/Fitnah and Blasphemy have been mentioned
separately in the Holy Quran.
The Holy Quran prescribes severe punishment for spreading "Al-Fitnah" or "Al-Fasaad" on Allah's land (5:33). Allah tells us that Fitnah is worse than killing (2:191) ...... FITNAH means unrest or rebellion, especially against a rightful ruler. and FASAD means spreading mischief in a Muslim land, creating disorder in the Muslim community, or a revolution or war against a just government/establishment, or other similar things..
As for hate speech/blasphemy, the Holy Quran does not prescribe any worldly punishment for this offense. Quite the contrary, Allah tells us to ignore and avoid blasphemers, and leave it to Allah almighty to decide their fate (9:74, 4:140, 28:55, 7:199)
So, as per the Holy Quran, hate speech/blasphemy is not "Fitnah/Fasad"(Fasad is a crime punishable by death)...
Why can't we accept your interpretation/understanding ?
Because Blasphemy has been mentioned a number of times in the Holy Quran and Allah tells us to ignore blasphemers and leave it to him to decide their fate. "Fasad fil Arz" has also been mentioned and we are ordered to kill those "mufsideen"
If we accept your interpretation that blasphemy itself is Fasad fil Arz, then we will have to accept that the Holy Quran contradicts itself as it tells us to ignore blasphemers in few verses (including those revealed in Medina i.e. 4:140) while simultaneously asking us to kill them in some other verses....
Moreover, PPC has section related to "Blasphemy", and it accepts the Quranic principle of "Fasad fil Arz" ... But it does not recognize/declare blasphemy as "Fasad fil Arz"
Also the consensus among the Majority of Ulema in the past had been that Blasphemy is a pardonable offense... Which means that they also didn't consider Blasphemy as "Fasad fil Arz"
So your opinion is in contradiction with the Holy Quran, Hadith, and the consensus of the ulama of the past, therefore it can't be accepted