question #3 Sahih al-Bukhari 6896, Book 87, Hadith 35 : What are the implications of collective responsibility in Islamic jurisprudence as demonstrated by ‘Umar’s statement regarding the assassination?

A boy was assassinated. ‘Umar said, “If all the people of San’a took part in the assassination I would kill them all.”Al-Mughira bin Hakim said that his father said, “Four persons killed a boy, and ‘Umar said (as above).”Abu Bakr, Ibn Az-Zubair, ‘Ali and Suwaid bin Muqarrin gave the judgement of Al-Qisas (equality in punishment) in cases of slapping. And ‘Umar carried out Al-Qisas for a strike with a stick. And ‘Ali carried out Al-Qisas for three lashes with a whip. And Shuraih carried out for one last and for scratching.