Being single adoptive father and living in three countries (chronologically, Moldova, Russia, and Italy) I very often listen to such comments. About full adoptive family: “Well done! They’re very brave!” Single adoptive mother: “Oh, well… maybe she was very lonely. Good luck, anyway”. Single adoptive father: “WHY? He definitely into black market organ trade, or pervert, or some other sort of mad psychopath”.
Until 2015 I was thinking, that it is just some sort of anachronistic feelings in purely conservative ex-Soviet states (both Moldova and Russia were Soviet), but after moving with my children to developed nation, Italy, I found that situation is... well... better, but not much. Why?
P.S. Please, sorry for my English. It's not my native language.