Lama Ole’s answer:
There are two levels from which to see this. When one sees that people treat each other badly, it’s unpleasant and one thinks, “Why do they do that? In the next life they will swap roles and do it all over again. Why oh why?”
But at the same time, one can see things on the absolute level: both the victim and the perpetrator have buddha nature and at some point they will also realize it. For example, if someone came in here and threw a dozen hand grenades around, we certainly wouldn’t like it if bits of our precious bodies suddenly flew in all directions. We wouldn’t like it, but actually the trajectory of every piece of flesh, metal, and bone would follow the laws of higher mathematical wisdom. We must be free of attachment to our body, otherwise we’ll never understand the highest view.
Buddha gives us both levels of understanding. That’s what it is all about. Then at the end of our life, we can say—just as Caesar Augustus said as he lay dying—“If I played my role well, please applaud!” We do our best, and in the end we know we can let everything go because it is all just a dream anyway. We must meditate a lot to really understand this. But if we can grasp it conceptually as a first step, that’s also good.