I really disagree with your last point of framing birth families as victims; in my opinion, this mentality is quite prevalent in adoption circles and contributes to the problems discussed in this thread. Children get removed for a variety of reasons, so there's nuance, but in the UK you have an extensive net of support for people with mental illnesses and other issues, they get housing and benefits, etc. Respectfully, I think people born here take it for granted and bash it a lot, when in reality social support tends to be way above what it is in most places in the world. In my country of origin, this amount of social programs and benefits would be unthinkable and economically impossible to carry out.
More often than not, I find it's the consequences of the birth families' own actions that lead to child removal. Framing them as victims does a disservice to all involved, since it enables bio families to not address the problems of their choices and behaviours and the impact those have on others, including their biological children. Of course trauma has an impact on people, but the moment you inflict your own trauma on another person, you become responsible for the harm you perpetuate. This applies to everyone in the adoption triad, including adopted children who, after having reached an age of certain maturity and responsibility, still chose to hurt their parents and siblings due to their trauma, instead of dealing with it in better ways. I'm not suggesting we start to demonize people, but having trauma and a complicated family life does not give you a pass to engage in harmful behaviour and on top of that get a back pat. Parents who have given their children a lot of the tools to thrive in life have nothing to be ashamed of; of course there's always room for improvement, but a lot of these parents obviously are doing things well and trying their absolute best to help their children.
There's also the issue of social services being underfunded and adoption being the last resort; I don't disagree with adoption as a last resort, but in practice it means that funding for post adoption support comes last too. I know women who almost lost parental rights of their birth children, and they received extensive support to keep their children with them, sometimes not working for decades while they "got their life together" - which again, in my country of origin would be absolutely unthinkable to live off the government for decades, the social shame would rightly be tremendous and in all honesty I think there's a point in which it becomes a bit of a pisstake. I think they're good mothers so I support the decision to keep the families together, but they should do more to support themselves. After engaging with adoption services during 2024-2025, the feeling I get is that SWs try their hardest to keep bio families together, make prospective adopters aware of the traumas and developmental needs of adopted children and to make clear that love is not enough to magically solve everything, so some changes in the right direction are already being made, luckily. I really had issues with social workers during the process, but in all honesty they work pretty hard and they too are damned if you do, damned if you don't. I got the feeling that a lot of them were spread very thin but did all they could while following very strict guidelines.
I agree with other posters in that more contact with birth families is the wrong move as a general rule; for a lot of adopted children, that is where their trauma originated and it could easily become retraumatizing and trigger them further. A better solution would be to help adoptees with emotional regulation, better coping mechanisms instead of destructive ones and with creating a positive image of themselves independently of how others view them, be it adoptive or bio families, imo.
I'm an adopter who has met families in severe crisis and had my fair share of severe problems with my family as a teen due to several reasons, so I have a foot in both camps. Those things absolutely happen with birth children too, it's taboo to acknowledge but in my country of origin abuse between bio relatives is rampant (the lack of government help makes it harder to cut ties with abusive relatives). Some of the feelings and stories from difficult adopted children really resonate with me. If you are born in an environment that makes you internalize you're the problem, it is more likely that you will behave accordingly, thus reinforcing the cycle - it's hard to get out of it, and it's hard for other people to reach out to you and help you when you're in that state of mind. But healing is possible, and at the end of the day we are all responsible for our own actions and for our impact in the world and those around us.