After reviewing social media for both Joseph and Rachel several weeks ago, I always thought murder/suicide was a likely outcome. Joseph had dropped out of college and was into hallucinogens. I found hardly any photos on social media of Joseph with friends. He was also into cosplay, fantasy games and asian girls, perhaps to an unhealthy degree. In fact, if you peruse his "likes", it's fairly disturbing and definitely not "mainstream."
There is also one post on Joseph's Facebook from 2015, that in retrospect, I find very disturbing. Joseph captioned the photo "Things are not always what they seem."
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The trip up to the Joshua Tree area a couple weeks prior to his trip with Rachel also deserves another look. I doubt a lot of twenty year-olds go driving on Twentynine Palms Highway, "looking at restaurants and shops." Joseph and his buddy likely went up to the desert to do drugs, but it could have been more sinister. Messaros initially mentioned Joseph and his buddy were up there for a "scouting trip". Why would he have thought that or used those words? Maybe Joseph's buddy can help shed more light on this. I wonder if he will be questioned.
I believe Joseph was not in a good place and ultimately his unrequited love for Rachel led to the murder/suicide. Rachel may have unknowingly given mixed signals agreeing to an overnight trip with Joseph. Her social media indicated an interest in pot and raves and she had also recently dropped out of college. Perhaps she agreed only because she wanted to do some shrooms in the desert (apparently this is a thing), but he wanted something more. When she rebuffed his advances, he decided "if I can't have you, no one can".
I would much prefer that it be a mercy/suicide, but don't feel that's a likely scenario. Considering that in the almost three months that they were exposed to the elements and wild animals, I don't know that the positioning of their clothing tells us much. I don't know that I've ever heard of a mercy/suicide outside of situations involving illness and elderly people.
Because I am a father, I must say that I feel extreme sadness towards Joseph's father for I feel he may not have truly known his son (and I never want that to be the case with my own two son's). I can't blame him for wanting to believe the best in Joseph.