I have read about it because I have a godchild who had Reactive Attachment Disorder (RAD) (long ago recovered.) He is a child of a good friend, adopted from Russian institution at five with a sibling who also had Reactive Attachment Disorder (RAD) when adopted (and who has also recovered.) The mom of their is close to me and shared a lot of her search for information of Reactive Attachment Disorder (RAD). She came across (and I too read) Nancy Thomas and her ilk and all that 'attachment therapy' circle but went with mainstream, evidence based treatment instead and kids have fully recovered from Reactive Attachment Disorder (RAD). Both do have some neurological issues though. Other alcohol and drug exposure related other maybe alcohol related or not, but diagnosed as ADHD. But right now in their teens they are doing very well.
What do you mean by dangerous child? Aimless's child has not physically harmed anyone. Neither has either of mine (well, too badly, few concussions and broken bones, lots of cuts etc. but most not too intentional), nor have they burnt down any lived buildings (only one outbuilding) or anything like that. However I was once seriously scared my kid could turn into the school shooter and still can see that as a possibility how it could had gone if we had been bit less lucky.