When you enter a darkened room you don't attack the darkness, that would be futile. You simply turn on the light. Darkness is not a thing but an absence of something, an absence of light. Evil is not a thing but an absence of love resulting from fear. Darkness and fear can not prevail in the presence of love and light.
If we love everyone we meet and help them all we can, in practical, tangible ways, we can rid this world of fear, evil and darkness. So let's live in Love Not Fear. Let's do it now.