If you want to see the broken souls, the lost, the struggling ones, the unwanted, Go to the local humanitarian or volunteers association or clubs. It’s like a Reunion of the broken wings.
If you want to see the most racists, the supremacist, and the most self-centered people in the world, Go to the International humanitarian agencies (like Unicef, OMS, UnDP, World Bank, etc). They are all over there hiding under the banner of humanitarian actions.
If you want to see the psychopaths who luckily got a strong father at home, go to the multinational corporations. They are all managers there.
If you want to see the most lonely people in the world, go to the most hyped night club or bar in your city.
People who are used to go to the same bar finish to catch the same sexually transmitted disease.
Often, you can have a good idea of who people are by checking where they hang out.