Generally, Hollywood makes the same stories over and over. I've never wanted to do the same thing twice. If a script doesn't surprise me in some way, I simply can't commit to the project.
Thirdly, even if we assume that the world is governed by purpose, we need only add that this purpose - or, if there are several, at least one of them - is not especially intent on preventing suffering, whether it is indifferent to suffering or actually rejoices in it.