Hard to say. In clear cases like parental abuse, then sure the parents bear a lot more responsibility other factors. But the key thing is that there are other factors.
When someone we care for dies, maybe it isn't our fault, but nothing we tell ourselves isn't gonna remove whatever responsibility we feel for their deaths. I have had the fortune of knowing the intents of my two closest friends deaths. I knew it was inevitable, maybe not so soon, but I knew it was coming. If police read through our messages, I assume it would be enough for legal action to be taken, since we discussed methods, self harm, and wellā¦ everything.
In the end I know the decision was their own, but doesn't mean I don't feel intense amounts of guilt. Guilt I shared with one's brother and cousin. Guilt I shared with the others mother. Even when they told me it's not my fault it means nothing. I'll carry that guilt until I'm ash, there's no amount of convincing, be it through reason, knowledge, or emotion, that will ever release me of my burden.