> The fact that this still happened despite my many roadblocks and safe-guards I put in place really shocked me to the core. Not to mention the whole "am I terrible parent" question which naturally arises out of all this

I don't want to kick you when you're down, but you tried a technical solution on a human problem.

I don't think that's necessarily accurate. Can you elaborate on what a "human" solution would be in your mind? For us, it was a combination of technical, educational, and traditional parenting as well as some therapy for other behavioral issues exhibited in school. We had after-school classes and sports. We played board games as a family. From our perspective, we were doing things correctly in both the technical and human aspect of it to make sure it never got to that point, yet it still happened.

Given what this person has gone through, if you want to be critical then I think you owe us a more detailed explanation what exactly would have worked better. Armchair parenting is very easy.