I've noticed nihilistic thinking in Cook in Skins, and in the Comedian in Watchmen, both of whom are clear SLEs. I've also noticed it in myself, to some extent, and a coursemate who is a potential SLE. I think it's linked to their being SLEs, especially the kind of nihilistic thinking I've observed; it's the kind that isn't particularly philosophical or well thought out in some kind of structured thesis - it's almost inherent, like a natural way of looking at the world.
Have you noticed this in SLEs you know/have observed?
From where do you think this nihilism stems?