By far the biggest mistake we make is thinking that the way to deal with evil is through challenging it; evil is evil, it comes from forces of destructive lust, for as there is a pleasure in loving construction, there is the opposing evil pleasure in destructiveness, which is why there are arsons, terrorists, rapists etc. etc.; the way to banish evil, is never in challenging it on intellectual grounds, as our sages state, when your own demon, Yetzer Hara, evil forces come to you, just study some Torah, involve yourself in a higher cause, for a lot of light banishes all the evil known to man!