What losses are being socialized? This is a liquidity issue that is being reconciled with short term loans, not a solvency issue being bailed out with tax dollars.
So I don't know for sure, but my intuition is that if this were a great deal with no losses, there would have been a private solution.
The socialization of the losses is the mechanism where any losses that do happen will be passed on to other banks, who will pass that on in some way. I am certainly glad it isn't taxpayer funds, but it's not a free lunch.
I mean, they spent the weekend trying to find a private buyer and clearly nobody wanted it. Doesn't seem to be a reach to conclude it might not actually be a great deal for the new owners (the US government)...