If PFC is involved in the moral or emotional side of a predisposition to violence is relatively redundant. In reality, PFC deficits are probably involved in both sides, within distinct but interlinked substructures (Cristofori et al., 2016). HOWEVER, it is vital to consider longitudinal evidence in this case, to identify if the biological basis that seems to be present in fact has a social underpinning. Raine (2002) as a study does exactly that. They found that an overload in use of the PFC during development, due to the high social and executive functioning demands of late adolescence, can lead to PFC dysfunction in adulthood, behavioural inhibition failure and subsequently, a significant increase in violent behaviour.
Thus, again, social factors seem to be the things activating and multipying the biological predispositions for violent behaviour.