These parents did not protect their child...doors were left open, alarm lights were noticed, but noone checked on the kids.
They reversed the lock on their garage door which made access VERY easy for ANYONE WHO KNOWS THEM.
They brought back drunk, stoned "friends" at 2 am, while their children were asleep in the house.
All in all, I would say that they are unfit parents, regardless if DW did it or not.
Those remaining children are at risk. Obviously, the parents do NOT know how to protect their children.