Collective fear stimulates herd instinct

Mystery virus called QTB or commonly known as 'Female Plague' has spread across the Earth. It kills women exclusively and effectively. They are almost extinct. A discriminatory bug. Imagine that. One man has a daughter and she obviously needs protection from all the men in the world. John Hillcoat's The Road (2009) was very similar, also a lot better, but this still is a decent enough a survival movie directed and written by Casey Affleck.