I'm so confused.
Attachment disorders can be mild or severe.
Attachment disorders can also be caused by alcohol exposure before birth. It is hard to tell how much is from their early years before being placed in a stable, permanent home and how much was present at birth due to brain damage from alcohol. So we do know that a substantial part of it is neurological dysfunction, in which case the typical psychological therapies might not be very effective, because those are based on the assumption that it is entirely due to lack of healthy bonding. It could be partly this, in the case of children who have been bounced around, but therapists should also look at the possibility of permanent brain damage, in which the focus of therapy might be adjusted. My son has mild attachment symptoms.