It's tradition dating back to the 70's, the characters are nothing more than victims and hollywood directors seem unwilling to buck the trend and go with strong characters who do fight back and do survive..Instead we get the constant the world is so bad and depressing that we have to depress the audience and hammer away at them that no one can survive or only 1 person can survive, because we want to reflect the world we live in...whatever happened to film as escapism?,,,think back to the classics of sci-fi, and I don't mean just the films of the 70's , 80's and 90's...I mean those films that that are truly classic and are counted among the best of all time, they were not nihilistic, they offered escape, thrills and yes hope and belief in the ability of the human species....Again if these directors and writers are so damn depressed about the world, there is a simple solution open to them...they should leave the world, shuffle off the mortal coil...and take your depression and belief that the world is utterly hopeless with you