You seem to get a bit bogged down on that phrase,, 'arguing your own point's.' I suspect that is because you have no way of backing your points up, which is a shame, I thought you really might be about to reveal information of some use..
But really, you are taking the position that someone ELSE is to blame for these nice young men being compelled to go out and shoot random strangers, due to not being supervised enough and being allowed to play GTA and ditz around in the woods , firing off pretend guns, and 'camping out' and strutting around with Nazi armbands on, .. its an old story. Nothing new there.
In fact, these were one nearly 19 yr old and one 19 yr old, not children, and they were of a psychopathic nature.
AS and Mr McLeod were nothing if not genuine when they said their kids were nice boys, caring boys, and all that stuff, because they had been mirrored to most of the K and B ' lives.. That's how psychopaths are. That's what they do. They copy human behavior, like when to frown, when to laugh , when to look 'sympathetic', the usual stuff, and this is why parents , in particular are going to miss the signs. Everytime.
If you recall, the last phone call either parent got, the fathers noticed NOTHING WRONG!. they were still their lovely boys off on an adventure, yet, we know that by that time they were double killers, and one of their victims was a woman, and they arranged those victims bodies in a particular way, as a sign back to people. And now those parents know just how much they never knew. They were speaking to killers, and they never knew.
But the parents had , as is the usual way of psychopaths, no signs at all !
Which makes your proposition that parents should be aware one of real difficulty, and hardly a feasible position to take.