  With respect to the charge of moral skepticism, one can argue that sound moral judgment need only take into consideration what one knows over the practically available period of time. Then one need only be aware of a prima facie duty to prevent what ones current evidence indicates to be bad states of affairs to have all one needs to act rightly, whether or not the action has the best outcome. In short, right action is based on known goods and bads, not a set that contains unknown goods and bads. Being unknown, they simply can't and so needn't be taken into consideration, bracketing issues of foreseeability. So in the assassinated terrorist case, there is one known bad outcome immanent – the death – so there is one reason to intervene, and there is no known (or probable or foreseeable) bad, or if there are, such as slightly wounding the assailant, they are clearly outweighed, so the right thing to do is to intervene. So the consequentialist portion of one's moral theory can be made adequately subjective to avoid the problem. (Bergmann and Rea 2005 pursue a defense along these lines.)  An alternative reply is to adopt a proximate consequentialism that only assesses the direct causal consequences of an act or otherwise more narrowly circumscribes the delineation of consequences (see Sinott-Armstrong 2011 for an account of direct causal consequentialism, see Collins, Hall, Paul 2004 on denying the transitivity of causation). 