We're not saying that the whole world is evil, but that, according to the Bible, Satan is the ruler of this world, and most people follow him, and cause unbelievable suffering millions of people and billions of animals every year.
We don't believe that we are accurate when we speak in such generalities. For example, commerce in itself in not necessarily evil; it can also do a lot of good, and supply the money necessary to help many humans and animals. On the other hand the love of money is the root of all sorts of evil.
In the same light, not all leaders are evil. We need to see them as God sees them.
But above all, we are to seek to live in the perfection of God's love and heavenly will, being His peacemaking children who work to free this world from it's present corruption.
In the Love of the Lord,
Frank and Mary