The government have slashed social care budgets by 35%. If an adult is claiming to be a child, they will be using the scarce resources that could be spent on actual children. I think we, as a privileged society, certainly need to do more to support all humans who have been traumatised by war and poverty. I don't think that pretending adult men don't lie to get in is helpful. I would do the same if it were my family member, I am casting no judgement. I am expressing concern that precious social care resources are being wasted.
There is a lot of typical MN virtue signalling. Perhaps you'd feel differently if you knew the male "child" in the room next door to your vulnerable daughter in the residential home for foster children was actually 20 odd. Perhaps you have opened your home to foster children and find that suddenly, it's not a child.
Social workers do not have magical powers. There is no particular expertise or concrete training on this. There are so many times when we know people are having us on but we cannot prove it, so just in case, 22 year old Ali goes to Mrs Smith who is a foster career with 2 teenage daughters.