 Another worry about Dretske’s and Nozick’s response to Cartesian skepticism is that it forces us to give up K (as well as GK, and closure across instantiation and simplification). Given the intuitive appeal of these principles, some theorists have looked for alternative ways of explaining skepticism, which they then offer as superior in part on the grounds that they do no violence to K. Consider two possibilities, one offered by advocates of the safe indication theory, and one by contextualists.