Tell me you are joking. Apart from the huge tax revenues the banking sector contributes, wihthut banking, business ceases to grow - they need to borrow. Now admittedly the Banks are not lending as much as they could be despite Goverment intervention, but a few guys falsifying LIBOR doesnt mean the whole sector is to blame.
Business cease to grow because they are crying out for money and they are not getting it; no loans or because the banks computer system has shut down. And it was a more than a "few guys."