Good message, but....
I agree, we would be better off without guns. Keep in mind that we're talking about a Utopian society here. But as long as everyone is different, this is just not possible.
There was one thing that I didn't think was true about the movie. When it says "Number of problems solved by guns: 0", to me that is untrue. Without the use of guns, the world would have been taken over by madmen (Adolf Hitler and Sadam Hussein for example). If guns were not used to stop Hitler, how many more Jews would have been killed?