stranger in a strange land

i want to know if there really is a point where some one just gives up on every thing. the point where, like the lemmings, they run and run until they reach the edge of the cliff by the ocean and just leap off of it. like that photograph by yves klein where he's just falling into the street and looks completely guilt and burden-free. there must be people who feel like that, like they just really do not care about anything, either that, or they just care about everything