I am saying is that to say Ms. Palin or the "Right" are responsible for this is stretching credibility.
Define "are responsible." You are perhaps correct in only the narrowest of intepretations of the word "responsibility." Are they directly responsible (assuming this does turn out to be politically motivated)? No.
Could they be indirectly responsible? Yes. Could they have created an environment in which such an act might seem appropriate to someone with mental issues? Absolutely. So I do not agree that it is "stretching credibility" to place on them a modicum of blame.
The is a question of duty. Do politicians who have a platform from which to disseminate information and incite the passions of their constituents have a responsibility to do so in a manner so as to not give the appearance of promoting violence? I say yes. On this element, Sarah Palin fails.
I don't agree with your examples of Menachem Begin [Rabin]
And you are correct, it was Rabin, not Begin. However, your opinion that Netanyahu's precipitating actions (in an attempt to get elected and starting months prior to the assassination) did not contribute to Rabin's assassination places you at odds with the vast majority of political scientists.
Sound familiar?
Likud Leader (and future Prime Minister) Benjamin Netanyahu accused Rabin’s government of being “removedfrom Jewish tradition ... and Jewish values.” Netanyahu addressed protesters of the Oslo movement at rallies where posters portrayed Rabin in a Nazi SS uniform or being the target by in the cross-hairs of a sniper. Rabin accused Netanyahu of provoking violence, a charge which Netanyahu strenously denied. [ 1 ]