To make it clear, I don't think a return to the birth parents is in the childs interests based on the fact adoptive parents are a lesser type of parent. Because of the type of work I do I'm involved with adults that have often had pretty tough backgrounds themselves. This also includes those who grew up in the care system. Many of them have major issues related to their birth parents. And this isn't limited to those who didn't have stable care homes and birth parents who weren't fit to raise them. There's adults who by their own admission had long term foster/ adoptive parents they still relate to as parents and felt loved and cherished by, but still harbour massive resentment about the fact their birth parents could have raised them with support early on, or at least could have had regular contact and been involved in their lives.
I do also fully understand all the reasons decisions need to be made quickly about a childs future. What many people don't know is it isn't always the case that it's needed to prevent the child spending time in limbo and to prevent disruption. They can be rushed through while the child is still living with the birth parents too.
I do think sometimes adoption is a cost thing too. Not in a direct individual decision way by individual professionals. But in support that isn't available early on. Take eg a teen mum that's been spat out by the care system. Or pnd etc in parents without family/ friend support. Because the support isn't there in the first place, by the time it gets bad enough they get even the token level of help, quite often they are beyond the point of quick return. Or likely to be quickly signed off by services in a year etc. When the decision then has to be made whether waiting is in the childs interest. So yes, I do think in many cases lack of money to offer help as a preventative measure before there are bigger problems is partly why some adoptions are a cheaper option.
Plus let's be honest, having services scrutinising every aspect of your parenting isn't exactly empowering for any of us. If you're already starting off with mild issues that involvement and scrutiny can soon exacerbate them. Trust me I know full well why that involvement and scrutiny is vital, but as the extra support isn't offered alongside it's a vicious circle. More you struggle, more scrutiny. The more scrutiny, the more you struggle. And that's with a great sw and the services actually trying their best. An indifferent sw, or one who always assumes the worst, or some missing paperwork about your background etc and you're fighting an uphill battle. And if you have just one meeting with the one idiot professional in a 50 mile radius, that mild, and manageable pnd, lack of life skills or any other problem that can be remedied if supported early on, can very easily escalate into not being capable of meeting the childs needs short term. And then decisions have to be made quickly.
I also know the shit/ indifferent professionals are just as happy to lie/ twist things to adoptive parents too. Like not explaining the child they think they are able to adopt once everyone is satisfied with the settling in etc isn't legally available for adoption at that point in time. I don't mean because the child has been 'stolen' from birth parents in the majority of cases, simply that the adoptive parents haven't been told the child has been placed with them already to avoid the limbo period in short term care waiting for an adoption order, which of course they have a right to be informed of.