Ilios
Winger
Do you want people to be nice to you? If you do, then it is in your best interet to be nice to others, and if others think similarly, you can work together to construct a society where people generally treat other well. Because it is in the best interest of the group.Why is it nice to be nice
It isn't rocket science.
If I don't want people to steal from me, then I don't steal from others. We can then agree social contracts where we don't steal each others things, bevause it is in everybodies best interest - including the thief - because he'd then be subject to thievery also, and nobody ever has any peace.