The reason shares are so depressed is market sentiment, at the moment market sentiment in the finicial markets around banks and finacial institution is very low, short/medium term sentiment can have a big impact on share prices.
All this market turmoil is nothing new, remember the dot come bubble bursting, the UK being forced forced out the ERM?, at the moment all banks are taking a battering but the shares are hugely oversold IMO, banks that are solid, like barclays, HSBC, RBS could well come out of this crisis stronger than before with less competition and bigger global reach, Barclays are looking to buy up some of Lemans US operations
Of course at the moment, it's a case of sitting tight and holding your nerve if you have shares in these companies, i bought some more RBS shares yesterday as the bank is very profitable and fundamentally sound, all the headline talk of RBS first loss was a classic example, the bank did make a loss as it had to write down the value of some US market related investments (subprime) yet if you look beyond that exceptional loss the bank made over 5 bil profit down only 3% on the year before for the first half of the year
I remember houses being dirst cheap in 1992, not so cheap now even in the middle of this crisis, now is the time IMO to invest in good quality banking stock, it's all about risk at the end of the day and everything you do has risk from buying a house to picking were you work to choosing a career shares are no differant and right now bank shares look a good prospect for a few years down the line when the current recession blows over and there back to raking in billions every year to turn a nice tidy profit