Its the most pathetic things on the face of the earth and quite unnatural in so many. Most animals have an instinct to leave the nest and ferret on their own. Your parents did their job raising you until you were 18 so why should they have to take care of you.
Have some self-respect and be homeless if you can't make it!
I don't see this as necessaryily being a negative. If the 18 year old is employed and contributing to the household, he could in fact be an asset to his parents if he's living at home.
If only. I suspect a good majority of them just find it more convenient to be able to play computer games and watch TV all day, and have the kind of freedom they enjoyed before they graduated and thought it would be so great getting away from mummie and daddie. Looking for work is hard work all by itself, to which many spoiled younguns today just say no. And then the rent comes due.
Unfortunately I have to say if the kiddos are that spoiled, Mom and Dad deserve to care for the little monsters they created. Kids can get lost all on their own, but they really can't spoil themselves.