Is epistemic safety threatened by Frankfurt cases? A reply to Kelp

I intend to argue that the counterexamples inspired by the Frankfurt-type cases against the necessity of an epistemic safety condition for knowledge are not plausible. The epistemic safety condition for knowledge is a modal condition recently supported by Sosa (2007) and Pritchard (2015), among others, and can be formulated as follows: (SC) If S knows that p on basis B, then S’s true belief that p could not have easily been false on basis B. I will try to argue that the safety condition, expressed in (SC), is still necessary for knowledge and that, therefore, epistemic safety is not threatened by Frankfurt type cases. In particular, I want to show that Kelp’s counterexamples are ineffective against (SC).