Why support a regional benefit cap but not regional benefit levels? And what level would the cap be set at it in London?
Instead of the social vivisection currently taking place, lowering the benefits bill requires an agenda that creates jobs, arms people with skills and lowers rents.
The £26,000 cap, which is introduced in four London boroughs today, will raise child poverty, increase homelessness and cost more than it saves.
As Owen Jones and Evan Harris show, you can make more headway pushing your agenda from the TV studios in Millbank than the green benches over the road.
Everyone waited for the Labour leader to say something on welfare. He did but (for obvious reasons) no one noticed.
The Conservatives' claim to be anything other than a predictably right-wing party is the real casualty of last week.
The PM says welfare must not be "a lifestyle choice". But Philpott's wife and girlfriend were in work.
The Treasury says that Osborne was unaware his car had been parked in a disabled bay after he got lunch at an M4 service station.
The Chancellor's decision to exploit the public grief over the deaths of the Philpott children in order to make the case for cutting welfare is political opportunism at its worst.
440,000 families will lose £16.90 a week as they are hit by both the bedroom tax and cuts to council tax support.