An article from Slate pointing out the upward trends.
"The only sound way to appraise the state of the world is to count. How many violent acts has the world seen compared with the number of opportunities? And is that number going up or down? As Bill Clinton likes to say, “Follow the trend lines, not the headlines.” We will see that the trend lines are more encouraging than a news junkie would guess."
Not that there are not downward trends but there are upward trends too!