Do atheists even need an objective moral system?

[pocaracas]

You could have copied just the relevant part:

I think that morality is a collection of concepts like mathematics, but one that addresses our actions.
[...]
Morality: Code of conduct based on the knowledge of good and bad. By itself, the definition of morality does not encompass any goals nor does it specify any actions that are exempt from its purview. Like mathematics, it is a tool of evaluation. Where math helps us evaluate physical objects, morality helps us evaluate actions of moral agents.

We then need to know what is good and what is bad... that was sadly missing in the long text concerning objective morality... and I didn't read it all

Let's forget the word "moral" exists, and focus on good and bad.
Is it good to spend a day drinking in front of the tv, instead of learning something new?
Is it good to kill of all those "who are currently suffering, are not contributing to the world and whose any potential contribution is easily outweighed by the drain on resources they are causing currently"?

What is good?
- Minimize suffering of all individuals? Even if that means increase the suffering of a few? (as in more taxes to pay for the caring of elderly and sick or wiping out these elderly and sick to decrease taxes on the remaining)
- Minimize suffering of each and every individual?
- Maximize pleasant feelings in each and every individual?
- Other?
- All of the above?

Intellectually, I have no answer to this.
I just spend my days doing what experience has led me into assuming that the best course of action is to disturb the minimum of people and please as many as possible, where the main recipients of such pleasing are my closest family and friends.