Do you have any evidence for that possibility? Do you have any evidence that Abby and Libby had the expertise to erase their digital footprints well enough to fool the FBI?
The actual police, huh? Really? When did they do that? Did they say that emphatically in a recent interview (i.e., as opposed to during the first weeks of the investigation)?
BBM
Now that's a bad straw man argument. I didn't claim that all acquaintances always address one another by name. In this particular situation, if BG had set up some kind of meeting with the girls, addressing them by name would have made it much easier to gain their compliance. Like it or not, his not using their names is evidence that he didn't know them. (What you do with people you know well is irrelevant.)
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There's also audio of Abby and Libby, and they made no reference to meeting anyone; we know that they chatted about ordinary girl stuff. That's also evidence that no meeting was planned (like it or not).
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Finally, they didn't seem to be very particular about what time they wanted to visit the Monon High Bridge. That's another argument against any sort of meeting (like it or not).
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You also have professional profilers stating that the victims were opportune. No one is claiming that profilers can't be wrong, but their analyses need to be considered.
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In short, you have no evidence whatsoever for any kind of meeting, and you have substantial evidence against that scenario.
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I would suggest that the idea of a meeting is being driven by wishful thinking; you wish to believe that Abby and Libby couldn't merely have been random victims of a sadistic serial killer. Because if they could be victims, anyone could be a victim—including you, including your loved ones. Believing that Abby and Libby participated in their own victimization, even in such a small way as setting up a mystery meeting, makes you a little more comfortable. From a psychological perspective, victim blaming is at the root of your theory, whether you realize it or not.