Nobody is impugning anybody's character. In fact, I stated that such a motive would probably not stem from a family member and also stated that I dont think Abby or Libby were previously victimized.. In the end, however, there are two general motives for the crime: 1.) targeted 2.) "random" attack- on victims determined to be convenient
The targeted motive could be based on any number of broad themes including personal revenge and fear that the victim would disclosure a secret that could lead to arrest, shame or other negative concequences for the perpetrator,
Knowledge of an ongoing sex crime by the victim would include the themes of public shaming, fear of arrest and fear of losing the relationship with the victim for the perpetrator. The fact that such a possibility includes three motivation themes, however, does not mean that it is the actual motive and there are no indications that it is. Rather, it is simply a stronger motive possibility than others.