The fact that other politicians have used the same rethoric would not imply that they all made right judgements, nor does it imply that Sarah Palin was very wise in using it too. It is pretty natural the press would point out the coincidence when an actual fatality happens, rather than in all other cases, and this makes the case of Giffords different from other "targets" of other politicians. The above question about choice of language is a matter of analysis of its won right. Of course, in a world of normal people everybody would be considered more than free to use such language (and worse) without expecting anyone to ever take it literally. Of course this is not in question. Eventually, the question of lucid judgement would be that of a person who is aware that nuts are around us, when he/she chooses words. The media sorces are not tying the shooting to the campaign causally, but merely noting the coincidence, or noting that such virtual ties have been commented upon. Most notably, Giffords herself was preoccupied, following another episode.