Perhaps but there is also a predisposition to be an alcholic, that does not make being one (getteing there) any less of a choice and staying in it any less of a disease..
I certainly believe that people are responsible for their own decisions. However, I also believe that a certain percentage of the population (perhaps 2-4%) is solely sexually attracted to members of their own sex. They can no more force themselves to find members of the opposite sex attractive than I can force myself to find other men attractive.