They were responsible for lots of over-leveraging by all the banks here in the UK. Which made us vulnerable when the world hiccupped.
Do you think every other country ended up taking over their own banks? They didn't, years of non-regulation created the perfect environment for a collapse.
Furthermore, Brooon's solution, of bailing out the banks, made us and subsequent generations much poorer and meant that no lessons were learned and have set things up for the next collapse.
I heard a few months ago that Rachel was about to reduce regulation on the banks. They never learn.