The beheading of Paul Johnson is disgusting and vile murder for its own sake, not in service of any true religious impulse or belief. These are thugs and they will pay for their inhuman brutality.
Muslims have never been silent about the evil done by these munafiqin claiming to carry the tandard of Islam.
And what about jihad? This is not it - killing an innocent man is hirabah. Jihad is a girl asking that she not be forced to take clothes off - itself as much an outrage as when women are forced to put clothes on. And Jihad can and sometimes must be violent - as with the Army of Thulfikar, who have taken to the streets of Najaf to rid their neighborhoods of evil thugs. Jihad is a continuum of pious resolve, self-examination, and Jacksonian defense. Islam is not a religion of peace, it is a religion of justice. And the divine justice upon the murderers of Mr. Johnson will be terrible indeed.
translation of the Latin: "if you desire peace, work for justice." Justice precedes peace, in other words. Sometimes, to achieve justice, one must work against peace in the short term - and that too is jihad.