Ya'quub, Mohammad exterminated the Jews and Christians in Medina and the entire Arabian peninsula, and he killed or force converted the pagans. You can claim this was just, but only by making a mockery of your sense of justice. As it says in the Hadith: “It has been narrated by ‘Umar b. al-Khattib that he heard the Messenger of Allah say: I will expel the Jews and Christians from the Arabian Peninsula and will not leave any but Muslim.” (Sahih Muslim Book 19, Hadith 4366). Mohammad set the precedent followed by all Muslims that came after him.
As I have said already, we do not see eye to eye on this. My sense of justice and your sense of justice are not the same. And I don't think we are going to change our views anytime soon. You will keep repeating what you are saying, and I will keep repeating what I am saying. To you your beliefs and to me mine.