I think that most people, if able to do what they want in life, would lead a very peaceful existence.
It probably all boils down to happiness. If you are happy, its hard to want to fight another.

Unfortunately, living in a man-made system is unnatural and leads to people being unhappy and therefore ripe for manipulation by a third party who then points and says 'they' are the cause of your unhappiness.

Then its off to war when really the problem was manufactured by the higher echelons of the system you are under, no matter the country.

When a person or group believes they are above another human because of status/education/privilege/gang etc. and exercises that belief through force or coercion, it really belittles the whole human race.

There is no difference between us except whose sperm fertilised whose egg.