" Am I really making the best use of my time on Earth by advocating freedom for 300 million angry cowards?"
No; you are advocating security for one angry coward.
The idea of fighting for freedom should never be for oneself. Anyone engaged in such a struggle should be every bit as resigned to dying in the struggle as he is interested in surviving it, enjoying it; the greatest reward is not securing freedom for self, but for the future.
Thomas Paine said, "If there must be trouble, let it be in my day, that my child may have peace." This is the conviction of a true father, patriot, and hero. It tells us to grow beyond ourselves and care for something outside our own skin.