How does one defeat evil by tolerating it? Would releasing rapists and murderers from prison liberate us all as well? Perhaps Ban-Ki-moon could do with a trip back to the drawing table on this quote?
This is the fundamental issue with people who do not possess a worldview based on dualism, they are incapable of doing what is required to vanquish evil from a space once and for all. Therefore, they will always allow evil back in the door to that space eventually, it is only a matter of time. I call it being "wishy-washy" or "spineless".