Would the ‘prophet’ have objected to those who kill critics and satirists (e.g. Charlie Hebdo cartoonists) for ‘insulting’ him. His track record in dealing with criticism suggests otherwise. Remember and mourn the poet Asma bint Marwan. An early victim of Islamic intolerance. Murdered on Muhammad’s orders at Medina around 624 CE.
Related in Ibn Ishaq: When the apostle (Muhammad) heard what she had said he said, “Who will rid me of Marwan’s daughter ( a poet who ridiculed him)?” Umayr b. Adiy al-Khatmi who was with him heard him, and that very night he went to her house and hilled her. In the morning he came to the apostle and told him what he had done and he (Muhammad) said, ‘You have pleased God and His apostle, O Umayr’ When he asked if he would have to bear any evil consequences the apostle said, ” Two goats wont butt their heads about her”, so Umayr went back to his people.
For much more about the links between Islamic teaching and violence, see: ‘Nothing to do with Islam? – Investigating the West’s Most Dangerous Blind Spot’