How would you make this world a better place to live in?

If there is no war, the world would be a better place to live. People always died when a war is occurring, this would cost government a lot of tax money, and most importantly, it break out families, It is really sad to see a father/son goes to the war and never comes back, Also violence is a big issue in the society now, the less violence there, is, the more safe neighborhood for the citizens. Violence also brings a lot of crime in the city, so if there is no violence, crime, war, the life would be a lot better.