In all seriousness, your GVT didn't have much of a choice BUT to nationalize certain banks (They're not nationalized...just partially owned - like a PPP). The mortgage crisis is nothing next to the credit crisis which it helped bring about. Fanny and Freddie weren't the last straw tho', nor the heaviest.
Lehman Brothers was the heavily weighted straw that broke the back...when they went down overnight, they defaulted on a butt-load of loans. Their fall took down a lot of other banks' assets/credit.
If the 9 'nationalized' banks were allowed to fall, the recession would be far deeper and longer than it's likely to be now. The bailed out banks ($850B Banks) are likely to hold onto the cash they receive over the next few months...and I don't see it (the money) really circulating anytime soon. Eventually, they'll loosen up and credit/loans will begin to flow once more....but if another HUGE bank like Lehman's is allowed to go down...then the $850B won't be enough to loosen the market enough for recovery.
It may sound like socialism...but it's not really that charitable.