>nature
Animals killing each other every day, and the insect world is even worse, with some species behaving in a very psychopathic way (eg, wasps incubating butterflies cocoons, like in a Alien movie).

>women
Everyone's know how these meatbags can destroy men's lives, and when they get older, they turn into disgusting landwhales. The beauty of most women only lasts for 5 years at most, a very short time frame.