BBM above Everyone is different, I'm no expert. GREAT POINT, THANK YOU 
Even those of us who have walked in similar shoes as the Reiners did with their son, only walked in similar shoes not their shoes. Can I second guess everything they did ? Sure, but why? It doesn't make sense of anything that happened nor help anyone else.
Imo
it's a search for logic that does not exist. Mental health is individual not one size fits all.
Even experts disagree on treatments and methods but every where I look posters on all forums seem to have all the answers - if only they had done this or that- My sense is it's given everybody a soapbox to air their views on mental health, addiction, etc but that most that is posted is presumptuous and is pretty insulting and disrespectful to the victims, Michelle and Rob and their family
From where I sit they loved their children, they made choices for their children and they did their absolute best.
Rob and Michelle's family hired Alan Jackson and it seems they are in sync ( family and lawyer) to proceed with a defense that the parents would have wanted. I am totally on board with whatever that defense is as I stand in support of the victims of this tragedy.
Just my opinion of course
While your post makes excellent points re the individuality of addiction and family dynamics.
There is studies that identify the contributing factors of those prone to addiction and the behaviours within the family circle that contribute to enabling an addict to behave as they do and for so long .
While it is not up to us to judge the victims parenting skills, we can come to a conclusion that the parenting methods did not work for varying reasons . Sometimes you have to cut the cord imo
It is also ironic you judge others for standing on their soapboxes while you pontificate from the pulpit
By talking about what led to the specific set of circumstances that led to such a horrific crime may help others understand where mistakes are made .
RR himself spoke about these mistakes in interviews so was open to discussion re mental health, parenting and addiction. If we don't discuss it ,things won't change and we will have a repeat of this deeply traumatising incident for another family .
There is no doubt Rob and Michele did their utmost to be the best parents they knew how to be and what they may have wanted for their son in addiction and mental health issues may not be what they wanted if they witnessed him murdering another so that is an assumption that they would have NGBRI as there preferred defence strategy as unfortunately they are not here as you state to assert nor defend
Healthy discussion and respectful debate of uncomfortable subjects is a good thing ,by shedding light into shadows brings opportunity for healing and betterment.
Edited to add . Trying to attain to a model of parenting where one tries to be the perfect parent and do everything right by your child can have its draw backs . We see this in the helicopter parenting analogy . The constant need to prevent your child from having anything other than a perfect childhood . The child become dependent, insecure and has no confidence in their abilities because they never had the opportunity to find their pathway in life or learn responsibility or life skills . What it definitely ensures is you will always keep that child dependent on you .
And that builds resentment and as the metaphoric dance continues into adulthood and micro managing all their mistakes the child now an adult is not a healthy functioning human being but a dysfunctional adult incapable of independent living making rebellious choices in the hope that with the next mistake they will finally reach a point that someone will recognise a plea for help and guidance imo