More recently, attention has turned to whether (i) is defensible. The challenge here is two-fold. First, we might doubt the coherence of the view that causal contributions come in degrees (Sartorio 2020). Second, even if we can identify a metaphysically respectable account of scalar causal contribution, it is not clear that it will possess the kind of moral significance capable of determining liability (Tadros 2018; Beebee &amp; Kaiserman 2020). However, work on the metaphysics of scalar causation is undergoing something of a renaissance. So perhaps we should not be overly skeptical about the prospects for vindicating the intuition that moral responsibility and liability are (in some way) sensitive to causal thresholds (for discussion, see Kaiserman 2017, 2018; Beebee &amp; Kaiserman 2020; Bernstein 2017).