Suppose Earth happened to be in the way of cosmic plans. Suppose aliens had destroyed the populations of a thousand planets. Nothing could stop them here - except a tiny percentage of Earth's population survived. One family in the town of Venice on the West Coast of Florida survived.
What would you have done in a suddenly hostile environment? Make the same mistakes as the people who preceded you?
Sometimes in the midst of a war/crisis, one may wonder who is really the enemy. Sometimes these enemies look like us. They may not want to destroy us but to use us in a different way. These enemies are as deadly toward the survival of our freedom as alien enemies would be to the survival of our complete world.