I can't answer to any of that, but I can imagine how sincerely Robbie and Jennifer likely entered into that adoption. The desire to grow their family, the belief that love can conquer all. I imagine they genuinely thought they could, in effect, rescue him, give him a better life, overcome his early childhood trauma. Did they think it was going to be a Lifetime movie? No, in sure they thought it would come with some challenges but IMO they couldn't have anticipated just how awful it was going to be.
It is tragic that, whatever combination of factors led to it, that his brain wired itself wrong. The way he over-talked the very judge about to sentence him, just stunning how dysregulated he is. And dangerous. Smart enough to pick up the jargon -- out of my mind, didn't know what I was doing -- and yet -- scary as hell -- he contemplated it, executed it, recalled it, and had no trouble justifying it. Thinly veiled 'they made me do it'. This truth of his that, had he been given 10 hours to spew it, still wouldn't have made any sense.
They were murdered for trying to love him.
No winners here.
JMO