Hi Sirona,
Just a quick note before I head to work, maybe I'll write a bit more later.
Why do we want a perfect world anyway?
Well, to be frank I no longer see things through the JW world view so it's hard for me to address your reply, (I really don't use the word perfection much) but a short answer to that question is compassion, from the perspective of relieving suffering.
I agree that yin and yang is natural, (I have an interest in Taoism) but only from the perspective of the relative. But I do not believe it applies to the "western" idea of good and evil, I think such an application is a misconception based on my understanding of the Chinese language (my native tongue) if you go with Taoist ideas.
Of course, people for the most part is going to have the same thinking as you mentioned, but it doesn't hurt to introduce the non-dual perspective. I'm guessing because you are relatively new to the board you have not seen this quote I've used before, so I'll end the message with this for now..
"Love your neighbor as yourself means your neighbor is yourself, and that recognition of oneness is love." -Eckhart Tolle