It does make me wonder how there are so many feral ghouls after 200 years. Wouldn't they starve? Die of thirst? Be killed by the hostile wildlife and gun-toting wastelanders? Die because of their massive decrease in intelligence? Do their brains stop deteriorating at a certain point or will they eventually drop brain dead? What about disease and illness? Why don't they attack each other and "normal" ghouls yet attack everything else? How are they able to function at all with such damage? How can they run so fast and be able to attack without causing serious harm to themselves? Oh, it's because of being mutated by radiation. Ok then... Weak.