Protection against the outside world

How far should I go to protect them, its not the outside that I worry about. Its the ones in the circle that I am concerned about, the ones that made the choice to drop them off,  like trash on the road. but after several years they show up trying to be mom and dad,  trying to ease their pain  ,maybe so they don't look so bad now and in the future , I am leary of their motives !  no not the kids,  but you right the parents. I wonder how long the play acting will last, is it to look good in the new family that they have recklessly started that arrived because of lies, cheat, no thought to anything or no consquences for their actions once again only hoping that someone else can once again step in and clean up their messes , that by everyone turning their heads or keeping their mouths shut to keep peace , they can play house once again, I guess I need to decide !