Well, right now "this world is more peaceful" it depends where you live: Go to south america like Venezuela, Brasil, Colombia, Salvador, Mexico see the world there or go to Middle East, specially Siria and around there and see there. Go to africa and visit some countries there and see too. It isn't a "World Peaceful" there too.
This is true when compared to the first world, but untrue compared to the way things were even a couple hundred years ago. Dozens of people killed in rioting is not the same thing as one tribe systematically conquering another tribe, killing all the men, adult women, and boys, and taking the girls as sex slaves -- the sort of practice you can read all about (and apparently God approves of, according to ancient Israelite priests) in the Bible (Torah).