In the world there are many types of people. The ancients call rulers who are humane and just; good and virtuous. (Think Yao, Shun, Yu and Wen.) And the ancients call those out to cause harm to the masses with ill intent; evil. (Think Chou Hsin.)
While many stories down the ages depict good triumphant over evil, the unscrupulous clamoring for more gains, influence or power still practice evil on their neighbors or fellow human beings. Since those evil find it both profitable and satisfying to hoodwink the gullible public and to bully the weak.
According to the Zhouyi, a good defense against evil is to guard against mistakes. (Refer to the first line of Hexagram 38 Kui / Opposition.)
If we are not greedy or gullible, we will not be easily deceived by evil people – creators of fictitious financial accounts or false markets to mislead the general public; terrorists; nations that harass other nations; strong states that bully weak states with impunity under the guise of benevolence and righteousness. (In the case of strong states bullying other states, do not place too high a hope with the United Nations. Think in terms of Vetoes.)
In times like this, if Man cannot get rid of the evil, we have to wait for Heaven to reduce powerful families or states which it invariably did throughout the ages to give some lasting peace to the world. (Refer to the third and top lines of Hexagram 11 Tai / Peace.) Since Heaven is on the side of the good. (TTC)
Meanwhile the good have to bear with it and let evil people gloat. (Think cycles.)