ISFPs seem to approach a value violation more directly on a case-by-case basis. They spend time on each individual situation, weighing up the arguments, and consulting their own feelings to make a decision on how to act. This can be more time consuming because, without the guidance of Ne, they can get lost in the conflicting feelings (however it can also be a positive thing as they are more circumspect and less likely to make rash judgments). This would fit with my own experience, as I always seem to be much more decisive than my tentative ISFP friends. Although, I suppose ISFPs could potentially respond more quickly if they go with the first inclination that pops into their head without considering the other issues - perhaps if that feeling is strong enough it takes over.