I just got done reading a hell of a book: Rogue State by William Blum. I would suggest reading it. Many critique it as being one sided (which it is), the topics and facts being taken out of context (probably true) and criticizing the fact Blum doesn't have any "real" qualifications to write about American diplomatic affairs. However, the same goes for the history books that are in our public schools and reported "news" on various media networks. So take what you can from this book, do some research of your own and form your own opinions, that is what I suggest.
In any event, after reading this hellific book, I felt tremendous despair. I was mentally paralyzed, not knowing how to think or what to do next. And then my mental training started to kick in. I prayed (in the nonreligious sense) and thought of peace. I hoped for peace for humanity. I thought of love, of the positive things we are capable of. Some of my cynicism did kick in still, and I joked about never wanting to pay taxes again. But in the long term, I will still pray for peace. I will do what I personally can to contribute to a positive cause. I can't save the world by myself, but I can help it by loving myself and my fellow humans, even the ones that sometimes trigger my despair.