When our children are young we teach them right from wrong, amongst all the other skills for life. When they reach a certain age some stop listening and make their own choices, influenced by whatever.
Parents cannot be held responsible if their adult children make bad choices. If your child is not living under your roof, you cannot influence it if it has chosen a wayward life style. The best you can do is encourage and support them in the right choices and not condone the destructive ones.
The mere fact that you have raised other children and their choices were different testifies to that. I would not accept that slur. I have known many social workers who themselves have come from places of dysfunction.
I would prefer to stay with my blood relatives (so long as they were not dysfunctional), rather than a stranger who I have no blood ties or connection with, other than the colour of my skin. When I was training there was much emphasis put on political correctness and the human element of the situation was overlooked.
I can understand if there was no one willing to care for the child within its birth family. But the stupidity of it is that when that child reaches a certain age they are able to look for their real family. Now, if idenitiy was not such an important issue that law would not be in force. Why take away a child's identity and sense of self and belonging in its formative years when those things are very important and only when the child is an adult; when all of the time has lapsed for it to be damaged, then turn around and say: right you now have the right to look for your biological folks. Is it me or is there something fundamentally wrong?