I've been thinking about how, as a couple, is it possible to dehumanise a person to the point where you can kill them, kill their baby, then drain their bank accounts and take over their ID for the next few years including calling their family.
We know Karlie had at least two relationships with older men who were part of this 'car club' or whatever, in Alice Springs.
[h=3]
"The Weekend Australian was told that Pearce-Stevenson had at one point had a relationship with an older man called Darren Ashley."[/h]
From A tragic journey into the Abyss (behind paywall).
Darren Ashley who stabbed his wife to death:
http://www.abc.net.au/news/2014-07-03/man-gets-life-in-prison-for-stabbing-wife-to-death/5568762
.. and now we hear she had a relationship with DH
http://www.news.com.au/national/cri...er-daniel-holdom/story-fns0kb1g-1227587627032
I think those two relationships alone are enough to give a girl a 'reputation' and induce hatred in disempowered females in her orbit. We know that most evolved women would blame the men in situations like this for taking advantage of a young vulnerable female, but other, more 'basic' women, will likely turn on the female involved, decide that she is 'less than', dehumanise her, bully her, enjoy it when she suffers, punish her.
I can see how an angry woman may want to see Karlie 'go down' especially if she is hurt and partly blames Karlie for that hurt.
Losing two of your children and your ability to walk is a lot of hurt.
I think that is enough motivation for DH to kill Karlie, and for his girlfriend to be fine with it to the point where she would use Karlie's single parents benefit, fake her ID, have no humanity towards her whatsoever, and pretend to be her to family and friends.
I also think drugs play a part in this.