I think literature and the movies have taught me all I need to know about orphans and orphanages.
Orphanages are largely either horribly nasty places (Annie, Despicable Me, The Kite Runner) or are filled with horrible nasty people (ie, Tom Riddle, the General (Assef)).
In every orphanage there is one clear "best" orphan (Oliver Twist, Annie, Jane) who is so precocious and talented (Margo, Edith, and Agnes; Harry; Lewis from Meet the Robinsons) and so adorable (all of the above) that this chosen orphan will eventually have a dream life far superior to those non-orphaned around them.
Also, it is exceptionally easy to adopt. Even supervillains can do it.