This can be said for a lot of the Russian greats. Why? I really don’t know, although I’m sure that countless university essays have been written that try to answer this. Personally I wouldn’t mind traveling to Russia and finding out for myself.
Dostoyevsky takes you from the highest, wealthiest levels of society down to the lowest criminals and scumbags. Indeed, along with the narrator himself, the two main characters move between these very different societies. Both were born into money and privilege but choose to associate with the criminal underground of pre-revolutionary Russia.