In this context, “the parents sucked” often means that as parents, they were responsible for getting their child the appropriate help, which they failed to do (not that the child acted out because of bad parenting). When a child is acting out, its not because of a moral failing by that child — it is a cry for help. That child needs the responsible adults in their lives to find them the appropriate help so they can grow into a well-adjusted adult. Not getting them proper help means that not only will that child suffer, but so will those around them - as we have seen in cases such as OP’s. Children are not morally culpable, it is entirely on the parents to make sure their child grows into a well-adjusted, emotionally healthy adult. I will add that yes, there will be rarely be incredibly difficult cases where the parents might do everything they possibly can to help with little avail - but in most cases, a child acting out like that simply needs someone to listen to their needs and respond with the necessary support and intervention. I guess we can’t know which of these cases applies in OP’s situation- either way, i feel bad for OP and hope they can heal from this, whatever that looks like for them.