It is an overwhelming amount of stupidity, but institutions can sometimes be more stupid than the individuals in them, and that's saying something with the police. I don't see what they would get out of this that they would have aimed for, though open to suggestions.
On what happens next, Dick's career being sunk would be great but I don't think it would create much change in the police. Is anyone putting forward a list of demands to reduce police violence against women?
On the protest side, it would be good if it stopped the Tories curtailing the right to protest even further, but given the lack of effective opposition in parliament atm I don't know if that's realistic.