*Admin Edit: This thread contains posts with a main focus on justice, which have been transfered here from the following thread:
Should Epicurean Philosophy Be Made More Accessible?
There is so much good stuff here, and interesting exchanges that I want to post comments on....plus my own thoughts and questions...and yet life calls me to other fun projects and activities.
If anyone is wondering why there are so few people actively engaging, this could be why. Any individual who is curious to study…

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There is no absolute virtue or eternal "concepts" of any kind (because there is nothing eternal in the universe except the atoms, which means that there are no eternal combinations that could form a basis for anything absolute; and because there is no "center" to the universe from which there could be a single perspective by which to judge all others; because there is no supernatural god whose perspective could be deemed to be the only correct one, etc.)
The ethics would be that all animals and humans feel pleasure and pain. When you cause pain to another human, it results in a mental and/or physical reaction...and also as when they are not consenting to the painful thing that was done to them. When you do this inside the tribe or community, then you are violating a kind of social contract of the mutual understanding "to do no harm". A tribe or community comes together for the benefits of shared interactions. So any kind of pain or harm goes against the purpose of the community. Yet as the population and civilization of Earth have increased, the boundaries of what is tribe or community are blurred. So now we must extend this "do no harm" to all people. We can use restorative justice...or if necessary when someone has caused violence and is dangerous we must take them out of the general population as a way to protect others...not as punishment, since punishment is a kind of violence. (My understanding of "free-will" is very complex).