Soulty- ah yes, what Churchill used to call his "black dog" moods. I get those too. They make it seem like life is hardly worth living. But then there are the other times when the world seems incredibly beautiful and nothing that is bad really matters, and those can make the whole deal worth it.
Yes.
Not so much "isolationism", I think, so much as it is this "me first" attitude. People only seem to care about what feels good to them now. After 9/11, it felt good to get back at those terrorists bastards. Afterwords, though, people fell away from commitment to a long term strategy to fight terror when they discovered that it would take more than a few months and probably many lives.
All of a sudden, what Bush says doesn't "feel good" anymore because no one wants to have to deal with commitment. What Kerry says apparently "feels good" to a lot of people, because it lacks commitment to any priciples or the will to hunker down for the long term and deal with the causes of our problems.