Gotta weigh in here.
Look, both the left and right carefully craft their rhetoric cuz they know their audiences; lots of surveys give them the hot buttons to push. look up 'jonathan haidt and emotional values of cons/liberals' or some such term and you will find studies showing conservatives to value traits like patriotic, tribal, xenophobic, loyal, valuing conformity. the left will be nurturing, passive/non-violent, appreciative of diversity, etc. Not trying to pass judgement here, that's what the studies say.
So, Palin et al carefully choose the 'don't retreat, reload', and 'spill the blood of tyrants' language cuz they know it appeals to the morals of their base. Just like the left trots out the 'never forget lynching of blacks in the south' phraseology when needed: guaranteed to energize the base.
Trouble is, 99% of conservatives merely get energized but 1% reads another, more extreme message: time to shoot someone.
That's why Palin/limbaugh/beck/etc are irresponsible.