The point is that you cannot remove all of the negativity and still have positive. Because negativity does exist we have a reference for positivity. Remove negative (or "bad") and the concept of positive (or "good") cannot exist.
I understand full well the concept of "better positives" in relation to "lesser positives." However, consider the continuum of energy and nature of energy.
The discrete interval where negative meets positive is neutrality - the fulcrum between the polar opposites. Shorten the lever extending from one side of the fulcrum and the lever extending from the other side must be shortened equally. One side cannot be erased without erasing the other side as well - leaving only neutrality.