It's incredibly complex. I've seen a great deal of support poured into families, some of whom could benefit from it and did and were desperate for the help. Others had needs themselves that went on, and on and on, often they were themselves abused children in adult bodies, and eventually supporting them had to be balanced with what the children were still experiencing for months or years while their parents were signed up for one more parenting course.
Of the children I've seen who had to be removed from their families, some were children I worried about for days before and during holidays because everything that could be done was being done, but I was afraid when I knew that someone outside the family wasn't going to see the child and know they were ok that day. One child, horribly, was seriously hurt during this 'waiting and evidence gathering' stage. But in balance to that - being in care is not a good thing for children, the evidence is overwhelming, (the system, not foster parents), and children carrying immense emotional trauma get shockingly little care or input, there is very little comprehension of the issues these children carry never mind support for them. Sometimes they are not removed to something 'better'. The other thing I've always been painfully aware of - of those children, I think only one was glad it happened and saw it as an escape. Of the others - I can think of several who I don't believe will thank anyone involved for being taken from their family, and will probably return straight back to them the moment they are old enough and grow up bitter about having been 'stolen' by the LA and a lot of do gooders.
One thing that might help long term is more options around 'open' adoptions, where the child isn't able to live with their family or the family to provide care or legal decisions for the child, but the child can have some ongoing participation with their parents, siblings, wider family, and those relationships valued the way that ongoing contact with a NRP is legally valued, even if has to be under close supervision and in a contact centre. It is beyond hard to do, is hard on adoptive parents, and would certainly not be a possibility for every child, the potential for negative influence on the child and the child's loyalties or affections being divided are only some of the tip of the ice berg. But those issues can be there anyway, and I wonder if for some children to have help to deal with these issues openly would make it less of a last ditch decision to permanently remove a child, or such an immense loss.