yes, i am a little confusing aren't i - sorry.
while i do believe in ka, i also believe the people can control it to a certain extent, i believe that susan was meant to die to enable roland to discover his journey to the dark tower, however i beleive that her means of death could have been altered. i was so very angry at roland for loosing sight of those around him when they needed him most.
if he had kept his wits about him susan may well have died knowing that roland truely loved her, as it was i felt that she died feeling that he had left her, roland also felt that he had let her die. if he had done more to save her he would have felt it easier to move on. but then again, it all comes back to Ka, because he would then not be the roland that we all know and love, and he may not have become so single minded in his obsession with the tower.
yep, i am certainly contrary