You meet a lot of beautiful, vibrant young people with ugly philosophies because they are still fresh and the ugliness hasn't had time to eat away at them. You can meet a slim, dark-haired girl in a club who calls herself a succubus and whispers in your ear that she wants to take your soul out through your lips, and you'll think yes, yes, of course, losing your soul can't be that bad if it looks this beautiful. The most handsome, lithe man you'll ever meet will hold your hand and smile while he talks about how if he ruled the Earth, he'd kill every rich person, every priest, every single mother—and you'll smile back, unthinking, because his face is like a sunset.
But nobody can stay beautiful for long with such ugliness inside them. Maybe it takes 5 years. Maybe it takes 40. But eventually, it'll fester and warp them, transform them from the inside, until they wear their ugliness on the outside, and their lives will take the crooked shape of the ideas they carried.
Don't listen to the ideas of young, beautiful people. Listen to the ideas of people who have managed to remain beautiful even long past the time when the world should have crushed them under the burden of ordinary existence.