The Free Will defence again. Decision making is a complex process that is not driven by 'free will' - how we decide and what we decide is determined by many factors.
Besides that, if you go by the bible it tells you that God created evil for His own purposes...so the presence of evil and strife in the world is not due to 'free will' but God.
Of course the truth is that we live in a natural world that produces diversity, diversity of thought and action. Everyone simply cannot think or act alike at all times.
