This is not to say that the U.S. has always acted in a way that reduces the risk of war. And obviously there's nothing positive to say about the 2003 invasion of Iraq. But the military itself does not inevitably lead to massive violence. Even in Iraq most of the casualties have come from Muslims killing Muslims.
http://en.wikipedia.org/wiki/Rwandan_Genocide
http://en.wikipedia.org/wiki/Syrian_civil_war
http://en.wikipedia.org/wiki/First_Chechen_War
http://en.wikipedia.org/wiki/Second_Chechen_War
http://en.wikipedia.org/wiki/2008_South_Ossetia_war (blame whichever side(s) you like)
This is not to say that the U.S. has always acted in a way that reduces the risk of war. And obviously there's nothing positive to say about the 2003 invasion of Iraq. But the military itself does not inevitably lead to massive violence. Even in Iraq most of the casualties have come from Muslims killing Muslims.