Assertion: serial killer's development | /r/CapableOf | prove to be key precondition
Facets:
value: for the emergence of serial murder
type: PURPOSE
Source sentences:
text: This development also proved to be a key precondition for the emergence of serial murder, given that a defining attribute of serial killers is that they prey on strangers (something that distinguishes them from the vast majority of homicides, which typically involve some form of prior relationship between killer and victim).