Everyone acts to their own perceived benefit, even when serving others or making self-sacrifices. The perceived benefit may not be immediate or short term, some act on much longer time horizons.
Discussion
If we’re all one everything comes back to us anyways. Many ways to perceive this game of being and acting.
Where did you get that we're all one? I think that may be an over-simplification. But I do agree there are many ways to perceive, perhaps as many ways as there are those who perceive.