Okay, but what you said was that any time we don't act and can act we are operating "in sin", which leads to the conclusion that if we don't always act in the m

Okay, but what you said was that any time we don't act and can act we are operating "in sin", which leads to the conclusion that if we don't always act in the most optimal way for society, we're acting in sin. So even if you didn't intend to, you just made all selfish acts sinful.