Imagine in a few months time that the slump in the housing market has "bottomed out", and that some confidence is starting to come back in to the market. What is the best way to shatter that new confidence ?
The answer is, of course, to re-introduce the stamp duty that has been temporarily suspended today.
The very same thing happened when the Tories tried this after the last housing crash and there is no reason to believe that it will not happen again this time.
The problem is, of course, that to do nothing at all would be negligent, so they are damned if they do, damned if they don't.