The 5 propositions
It is scientifically incorrect when people say that war cannot be ended because animals make war and because people are like animals. First it is not true because animals do not make war. Second, it is not true because we are not just like animals. Unlike animals, we have human culture that we can change. A culture that has war in one century may change and live at peace with their neighbours in another century.

It is scientifically incorrect when people say that war cannot be ended because it is part of human nature. Arguments about human nature cannot prove anything because our human culture gives us the ability to shape and change our nature from one generation to another. It is true that the genes that are transmitted in egg and sperm from parents to children influence the way we act. But it is also true that we are influenced by the culture in which we grow up and that we can take responsibility for our own actions.

It is scientifically incorrect when people say that violence cannot be ended because people and animals who are violent are able to live better and have more children than others. Actually, the evidence shows that people and animals do best when they learn how to work well with each other.

It is scientifically incorrect when people say that we have to be violent because of our brain. The brain is part of our body like our legs and hands. They can all be used for co operation just as well as they can be used for violence. Since the brain is the physical basis of our intelligence, it enables us to think of what we want to do and what we ought to do. And since the brain has a great capacity for learning, it is possible for us to invent new ways of doing things.

It is scientifically incorrect when people say that war is caused by 'instinct'. Most scientists do not use the term 'instinct' anymore because none of our behaviour is so determined that it cannot be changed by learning. Of course, we have emotions and motivations like fear, anger, sex, and hunger, but we are each responsible for the way we express them. In modern war, the decisions and actions of generals and soldiers are not usually emotional. Instead, they are doing their jobs the way they have been trained. When soldiers are trained for war and when people are trained to support a war, they are taught to hate and fear an enemy. The most important question is why they are trained and prepared that way in the first place by political leaders and the mass media.
We conclude that we are not condemned to war and violence because of our biology. Instead, it is possible for us to end war and the suffering it causes. We cannot do it by working alone, but only by working together. However, it makes a big difference whether or not each one of us believes that we can do it. Otherwise, we may not even try. War was invented in ancient times, and in the same way we can invent peace in our time. It is up to each of us to do our part.