The reason I can’t get behind BDI

If BDI, how do you justify the evidence of strangulation while JB was still alive? So the theory is that a son kills his sister in the heat of the moment, and to cover up for their son, the parents stage a molestation of their own daughter? Yes, I know the fact that they covered anything up makes them awful people, but that seems one step too far for me to comprehend. That’s the part I cannot wrap my head around and will never allow me to believe that BDI.

Would love to hear why you agree / disagree.