I can only hope it never happens.
I see that as a very unbalanced world, as you need both love and hate, positive and negative. Even in nature there is destruction before rebirth. In fact, destruction often makes for a better new life in nature. Humans, however, tend to let it swallow them whole and hide behind it.
I don't see why we want to go out of our way to destroy balance, instead of finding the lessons within the negative to make us appreciate the positive.