In this case "illiquid" and "crappy" securities are the same: securities that are worth much less today than they were yesterday and that are projected to be worth even less tomorrow and for which the bottom has not yet been predicted. Those are certainly "crappy" since no one holding them wants to be holding them. They are certainly "illiquid" since no one _else_ wants to hold them.
And your reference to the LTCM bailout are hardly reassuring.
This is a great deal _only_ for J.P. Morgan.
It's a very bad deal for U.S. citizens, most whom have no large holdings in J.P. Morgan. Essentially the taxpayer is taking on all of Bear Stearns' bad investments and J.P.Morgan is getting all the good parts of Bear Stearns at reduced price.
But that's only the beginning. The Fed guarantee to back up these 20 Wall Street firms for the next six months will be disastrous. That gives them 6 months to dump all their garbage onto the Fed. What a deal.
Hey, I've got a 1995 Buick that I can't sell and I'd like the Fed to buy it back for the $8000 I paid for it. I had no idea it wouldn't become a classic selling for twice what I paid for it. Justice! Give me justice!