Yes, you have astutely pointed out how politicians start wars.
However I don't care, because I am not a politician. For me it's not some John Lennon morality game where you take pretty pictures of yourself protesting and show the world what a saint you are, it's about actually ending the carnage. That's done through mass struggle, and every advantage helps.
My issue with pacifists is not that they start wars. In fact, I would consider even this to be an improvement as it would indicate something beyond self-indulgent impotence.