Unfortunately details like that are beyond the understanding of Polanski (remembering that after being elected Green Leader, when interviewed by Rory Stewart & Alistair Campbell Polanski didn't even understand the difference between "debt" and "deficit"). So Polanski has only looked at the bottom line profits and assumed the banks are ripping off customers and sees them as an easy target. So to me Polanski's proposal is daft whereas I think there is a case for a windfall tax on profits from unintended consequences.
That just isn't true. He may have momentarily used the wrong word - something that all people all do. Did Gordon Brown really believe that he ''had saved the world''? No. Did Starmer really express concern about ''the sausages''? No. What happened in that interview was Rory not accepting anything other than his old world Tory protected view about a functioning economy - which history should teach us has been a disaster.
What is coming across in the sum of your recent posts on this is that you resent Polanski because he has contributed to the party in terms of electoral success. You'd rather have a leader you like than one that advances the party. It's a view you are entitled to hold, but to me it looks odd.
Polanski's position is the position of Green Party policy. That is, that there needs to be a means of protecting people especially those made more vulnerable by interest rate shocks and the cruel effects of it on their household incomes. It is a matter of fact that when banks lend money, they create it by simply entering the amount of the loan on their balance sheet. Interest rates are set by the bank of England. Mortgages rates are mostly variable. This means that lending banks get a lift in their profits with every increase in lending rate. A change in the rate from 2% to 4% is not a 2% increase in profit, but a 100% increase. Yes they are already obliged to pay tax on that amount - but here's the thing - what did they have to do to earn it? Answer - nothing - it's tantamount to a gift of taxpayers earnings for no effort.
Under these circumstances, the banks can afford to pay more tax. To treat tax on an unexpected gift to a corporate company as theft is a nonsense, they are still being boosted by the rate rise.
These days in the age of very high house prices, people have very big mortgages just to get on the ladder. They need help, and the Green Party is setting out a viable means of help.