No one has that right.
Yesterday was a black day, indeed. When, for a short time, the sword was mightier than the pen.
What's to say that something you or I have published or said, or will publish or say, will not offend some idiot in the future. Some idiot who believes he has a religious or political right to murder you for it.
How I loathe the people who did this outrage. How I loathe people who think it was justified in any way.