Items such as the Giffords shooting have caused a large spiritual change in the country, even if it is not yet fully visible. We are more determined to have a country in which such things do not happen, and/or are understood/healed/prevented before a problem may occur.
We can grow from everyone carrying Hope (we did for two years) and now, back for some polarity swings and the associated determination to do better, to be better, to paraphrase the wonderful words of Gifford's husband.
Trouble brings out our compassion and opens our hearts. Makes us determine to be better, to live better, to seek a way to live more in line with the positive.