I've seen a couple people asking how BL could possibly be innocent in GP's disappearance and possible murder, and here is a theory.
What if they had another fight, and this time he left GP with the van so she didn't worry that he would leave her? He hitchhikes around while she works on video and returns to find her missing. He can't get ahold of her, panics and heads home, thinking she may be there. He gets there and no GP, but his parents convince him it will be fine and to stay home and regroup. When BLs parents hear from GPs parents, they realize something is amiss and lawyer up. As people take notice of the case, BL realizes that even if he didn't do it, his life is ruined and he has been convicted in the court of public opinion and goes into the woods and commits suicide. GP is later found, and the story has two victims.
The thing that first made me question BLs involvement was the Yosemite text. He knows they were planning on Yellowstone, he was the driver. I think someone may have met GP while BL was hitchhiking, and sent a text to cover but didn't correctly remember the park GP had mentioned.
Not saying this is the case, just saying that it is good to consider different angles. His parents did not react in a compassionate manner AT ALL, but people can be jerks when it comes to protecting their kids, and BL is young, seems anticonfrontational (from the body cam footage, at least), and would likely listen to his parents and later his attorney.
Just a theory. IMHO MOO etc.