This is an ominous question, but one that is very interesting. Of course, there will be differences of opinion. Also depending on where you live, there will be differences of thoughts. For example, the twelfth president of Nigeria, Olusegun Obasanjo stated that one of the problems his country has faced was from spiritual forces from the occult movements. We in the United States might not make this comment, but the Nigerian president did.
There are many religious people that would agree with Obassanjo. For example, some people take literally the words of the Apostle Paul when he says that we do not wrestle against flesh and blood, but against spiritual forces. (Ephesians 6).
Others will say that the influential forces of evil often times reside in the human heart. They cite the number of wars, poverty, the creation of weapon of mass destruction, and the like. This have a point. Why can't we get along?
In the end, this question is a matter of opinion, but there does seem to be a principle of evil in our world that always bring our world to the brink of destruction.