To be honest, this man could have murdered her anywhere. It just so happened to be in his car. If she didn't agree to go to the car with him, he could have dragged her to an alley and murdered her there instead. A person like that won't be stopped just because somebody exercised 'stranger danger' and didn't go into a car with them.
If Karen had stayed with her friends, the man would have just gone and did it to somebody else. He had no motive as such. he didn't know Karen prior to the attack. So there's no reason why it had to be her. She was just there. And if she wasn't, it would have been somebody else.
I think it's all well and good talking to our children about stranger danger. But we cannot teach them to be wary of everyone. We all talk to strangers everyday. It is impossible to function in modern society without trusting the strangers around us not to harm us.
I walk home alone in the dark quite a bit. I'm often stopped by lone men asking me for the time. I'm very wary that this could be a ploy to engage me in conversation for malicious reasons, such as stealing my phone when I bring it out to check the time, so I'm more alert than usual when in this sort of situation. So yes, I'm exercising some stranger danger awareness but I'm also not excluding myself from engaging with strangers. Imagine what the world would be like if we did that.
Everybody is a stranger at first. We aren't born knowing everyone.
If people want to go off with strangers/have one night stands etc - that is their choice. And i'd bet the vast majority of people who have done this (me included) have had a great time. The chance of being murdered, however slim, is there of course. But it's also there when walking home from work along a quiet street in the dark, stone cold sober.
I just think it's easier to victim blame the woman in such situations when she has been drinking. As if it's somehow her fault that she was murdered.
I wonder if the situation was different. Imagine if Karen had just been walking home home from uni alone one dark evening, and met Pacteau in the street. And he murdered her. I wonder if there would be less victim blaming if alcohol and a night out wasn't involved?