They could, of course, give a shit about 4 dead Americans.
What they're really pissed about, besides Obama's re-election, is that there have been no legitimate scandals (which I guess are sorta like legitimate rape), so they have to come up with non-starters like Solyndra and apology tours and bowing to foreign leaders and suchlike to keep the droolers fired up.
When your whole political strategy depends on keeping the sheep enraged, you gotta keep coming up with things to enrage them. Fortunately for the demagogues, the sheep are more interested in being enraged than they are in whether or not the rage triggers make any sense.
Another way of looking at it is that the Dittoheads get addicted to the natural body chemicals (nor-Epinephrine, cortisol, etc.) produced by chronic anger, so Rushbo has to keep the fixes coming.