Seems like a no brainer to me. The 2 yr old doesn't need it ... The parents need it cause they don't want to have confrontation at bed time ... They just want to kid to shut up and go to sleep.
This is a massive pet peeve of mine. I am extremely irritated with the practise of giving in to a child to make life easy NOW. If you put in the work with children, do the hard thing FIRST, then they will learn what is right.