This is how the world is. You will meet all kinds of people, encounter incomprehensible malice, and feel disappointed, but as long as you get through it, you will find that these are actually reminding you not to become that kind of person.
As Goethe said: "Life is like a river. Only by flowing forward can it remain clear." The meaning of experience is to guide you, not to define you.
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Remember: You can stare into the abyss, but you cannot stop.