JFK never "declared war on Vietnam" any more than GW Bush declared war on Iraq. But you are right, neither can be called a 'man of peace'. As for Cat Stevens, of course it is ridiculous to view him as the personification of Islam and condemn him for everything from suicide bombers to mob violence, but I do think he should have spoken out against the Rushdie fatwa (not that he was responsible for it, or could have ended it).