the failure of Condem logic

The condem government has announced today, plans to take away housing benefit from those under 25. It might sound good, in theory that all the jobless young people have to live with their parents until they find a job, or if they lose their job, but...

I have a problem with their plans. Well, actually, they have a problem with their plans. As it is direct contradiction of another plan of theirs. The so called 'bedroom tax' means that households who are seen to be over occupying their houses are only going to get housing benefit for the rooms they need. Effectively forcing them to down size.

So, heres a little scenario I like to call the failure of Condem logic.

Mr and Mrs Smith rent a 3 bed council house. They live their with their 2 children. As is usual, when the children reach 18, they move out. One of them has decided to go to university, and the other finds themselves a job and moves into a house share with some of their friends.

Now Mr and Mrs Smith are seen to be over occupying they are forced to downsize, and thanks to the help of the council, they move into a one bed flat, just right for their needs.

However, 3 years later, the first child finishes university and due to the job market can't find somewhere to live. So they have to claim benefits, but because of the new housing benefit policy can't claim housing benefit, and because of thie new housing policy can't move back with mum and dad because they have been forced to downsize. And then, the other childs job falls through and they have the same problem..

Is it just me that sees a flaw in this plan?