Yeah, after I kill someone I always think, "Crap, I should have just taken them home....."
But you made me think of something:
What if she was this evil mastermind and he was just a poor schmo caught in her web of lies? We're being told that Petito was a shining beacon of all that is good, but the news people said that about Michael Avenatti, too.
So what if they were robbing people to finance their travel, and she was the aggressor instead of him? She bullied him into being with her, and one day she attacked him and he accidentally killed her. Because he's not the brightest bulb, instead of calling the cops he freaked and drove home, and proceeded to do stupid things from there.
What if she's not really dead? What if she's doing a Gone Girl and the remains they found aren't really her? What if she faked her death, set up somewhere, and Brian Laundrie met up with her as planned?
It really could be anything, so I don't want to get too invested in these people until it's all settled and we know for sure who the bad guy is.
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That's how I think.