I quite agree.
However there is another point I wish to bring up.
You mentioned adoption.A very dear friend realised she could not have children,and so she and her husband adopted two children through Eidhi in Islamabad.The elder, a baby girl is special needs,and was abandoned.The second is a healthy baby boy whose mother was unmarried.
Anyways,whilst discussing this issue some time ago someone mentioned that when their daughter reaches puberty her father will be a na mahram for her, and vice versa for my friend and her son. Can someone clarify this....and if it's true,then maybe this is why some men balk at the idea of adoption.It seems very sad.
someone mentioned a scenario like this some time ago on Gs. and from what i remember the person said if the baby is breastfed from the adoptive mother or other female in the family, then that child is now a mehram.