Peace in an imperfect world always requires people willing to defend it.
Your second reminds me of a friend back in Narnia, one of the bravest knights I ever knew. He would consider this place a grand adventure.
That last reminds me of how Aslan works as well. He helps us when we've no other recourse, but he more often, he teaches us and lets us act as we will. Even if we sometimes fail him.