Why has Man always created a conflict in himself and in the relationship with the others?

Why has Man always created a conflict in himself and in the relationship with others  - and consequently violence, and the hope about achieving something through violence?

Man has tied himself to a way of life, which leads to war, and yet he at the same time wants peace and freedom; but it is peace and freedom exclusively as an idea, an ideology.

And at the same time Man is historical limited by everything he does.