Why are Americans such assholes?

The above billboard was in Tucson, Arizona!

Gawkler reports:

A reporter in Arizona tells us, "KNST tells me they took that billboard down at 9:30 a.m. Monday morning." Not quite quick enough to beat the internet.

If images and statements associated with violence didn't have anything to do with what recently happened in Tuscon, why did they take the sign down?  Shouldn't these same people re-double, in fact "re-load" their campaign against the evil liberal empire and stand their ground in their honest attempt to sell hatred and violence to the indolent and ignorant?

When are Americans going to stand up to the extremists in the right and label those who pursue a violent and nihilistic vision of politics as the real "anti-Americans!"