The horrific terrorist killings in Oslo, motivated by anti-Muslim and anti-immigrant sentiment by the terrorist, makes me very worried about the growing anger and hatred expressed in the United States, especially by the extreme right.
We saw something of that in the attempted assassination of the Arizona congresswoman earlier this year (although we don't know the gunman's motives, anger was in the political atmosphere of the country at the time). After that incident, everyone from right and left stated that we needed to restore civility to our politics. Unfortunately, that didn't last very long. The current debate -- if you want to call it that -- over the debt ceiling has seen very acrimonious discourse, again, especially by the Tea Party types.
I'm worried that at some point -- not in Congress, but among the rank and file -- they, like the Oslo terrorist, will cross over a boundary that will lead to irrational behavior, including violence.
Even as a historian, I can't recall such venomous statements against the President of the United States. Some on the extreme right seem to consider President Obama and the Democrats not as political opposition, but as the enemy.