I'm not sure what I think about the 'different times' argument. On one hand I can see it - all of us can, I'm sure, think of attitudes and behaviour that has changed in acceptability over our lifetimes. On the other, there is an argument that wrong is wrong, and we tried war criminals years after their crimes, and even when they regret what they did in their youth when 'times were different' and 'they were only obeying orders'.
Like so many things, there were people involved at all levels. The parents, the people who worked in the homes, the government, the NHS (I assume), social workers who took the babies, the adoption agencies, and arguably even the adoptive parents. Are they equally culpable, or are there degrees of blame?
A teacher who caned children would rightly be prosecuted for assault now, but what about those who did so in the 1970s? It's the same offence, but times and attitudes were different.
What is the point of retrospective justice? I don't know the answer to that, and I'm not sure that it is true that only the people involved can know what is fair. The law doesn't work like that. People who have lost loved ones to murder would probably argue for heinous punishments, and who can blame them - if my children were victims I would do the same. We have to have a considered approach, and it is not fair to punish people for things that were not considered crimes when they happened.
In many cases, the parents who disowned the girls would have done so not just because of approbation from neighbours, but also because they couldn't afford to feed another family member. A young woman would be expected to earn money for the family, which meant that staying home with a baby created two extra mouths to feed.
Many people complain about benefits, but they did give people options they hadn't had before. Is it better to encourage young women to have babies by housing them and giving them benefits, or to effectively disallow them the option to keep their babies by not providing childcare? There are too many variables in both cases, I think.
I have no experience of forced adoption, but having had two babies I can imagine how traumatic it must have been, and my heart aches for the women who had it happen to them, but at least some of the people involved must have thought they were acting for the best. It's another one of those situations where there are more questions than answers, I think.