However, an important challenge for the global view is whether it can impose a principled limit on the range of threats for which an individual can be liable. In Simultaneous Hit Men, the two threats are concurrent and qualitatively similar. But if we reject the idea that agents can be liable only to avert threats to which they causally contribute, then it is hard to see why agents are not potentially liable with respect to all manner of threats that are distant in space and time (McMahan 2005a: 763. For a defense of this implication, see Øverland 2011). Intuitively, it looks like we want a view that is global, but not too global, but a middle position might not be tenable.