We marked an important general characteristic of all living organisms as SELF-INTEREST. If there is some kind of coexistence in living nature, there is also a common interest so that the benefits of it can flow to the participants of the whole group. From the point of view of the individual, it is therefore a kind of SHARED INTEREST, as we share it with other members of the group. Here I call a group everything from two people who act, work or live together in some way, through family, kinship, groups of people who identify with each other, have or maintain the same traditions, municipality, region, country or state, to small and large groupings of states, including members of the same or similar religion who form churches.
However, the relationship between SELF-INTEREST and SHARED INTEREST is important. That relationship can be easily observed, but sometimes also hidden or even masked. Both interests can work together in harmony so that their effect is amplified. But they can even bother each other, standing against each other. Sometimes the SELF-INTEREST of an individual or a group of people is hidden, disguised and betrayed or replaced by a general INTEREST SHARED by everyone, which then begins to be imposed on them sometimes even against their real SELF-INTEREST.