Because these are the people who rule over us. With all the information in the world at their fingertips, they remain willfully ignorant. Apparently unable to recall what they pay their cleaners or work out what annual salary the minimum wage equates to.

Meet the rich

How much, we asked our group, would it take to put someone in the top 10% of earners? They put the figure at £162,000. In fact, in 2007 it was around £39,825, the point at which the top tax band began. Our group found it hard to believe that nine-tenths of the UK's 32m taxpayers earned less than that. As for the poverty threshold, our lawyers and bankers fixed it at £22,000. But that sum was just under median earnings, which meant they regarded ordinary wages as poverty pay.

Mistakes such as these should disqualify the wealthy from pontificating about taxation or redistribution. And yet City views carry great weight with ministers and politicians of all parties.

Neither the Guardian nor Polly Toynbee are agitating for revolution, of course. They cling to the belief that information will solve everything. They're liberals, it's what they do.

But they're right, we should be angry. And the abject ignorance of the very wealthy should be highlighted at every opportunity. These are not credible people and their lack of credibility matters.