Doubt and contradiction in buddhas teaching
No need to worry about this scenario. Even during the Buddha's time, at the peak of the Dhamma, how many people attained enlightenment and how many did not? By the way, with or without enlightenment, the universe will go thru periods of birth, decay, and destruction. It's inevitable that one day life as we know it will cease to exist. And one day, life will spring up again. Hence the endless cycle of Samsara.
Well, as the saying goes, there's a big difference between knowing the path and walking the path.
One can equanimously execute countermeasures to incapacitate a rapist or molester without letting anger arises. Matter of fact, martial arts practitioners are trained to keep a cool head. Anger, rage, fear, etc. only cloud one's mind and make it much harder to handle rough situations.