People have this idea that there are always two opposites in every situation: there is no good without bad, not happiness without sadness, no life without death. This is simply not something that applies universally. There is only positive temperature, we only move forward in time, entropy only increases.
This came up again because some economics friend was talking about economic choices, and how they simply choose to maximize the total benefits, even if it produces some costs. What if there was a different choice that could be made where there were zero costs, but less total benefit? The economists would ignore it.
Simply put, every decision does not have to involve costs, or pain, or the bad side of things. In many cases, we can make decisions that only result in good consequences. I think that this is what we should strive for.
EDIT: to clarify, the two questions are:
1. Do opposites always have to exist?
2. Maximize gain or minimize loss?