 Among the reasons to worry about blockage cases is that they may, contrary to what’s intended, render Jones’ choice causally determined, again putting his responsibility into question. After all, the objection goes, there seems little if any difference between saying (i) that structures and processes set up in Jones’ brain block off all alternatives other than choosing to vote for the Republican, and (ii) that Jones’ choice is causally determined by those same structures and processes. (For further critical discussion of such cases, see, e.g., O’Connor 2000: 83–84; Ekstrom 2002; Ginet 1996 [2001 addendum]; 2003; Kane 2003; Timpe 2013: ch. 6. An important response to the dilemma defense not considered here is Stump 1996; see also Goetz 1999; Stump 1999.)