The point of Samsara?
There's no such thing as friends and enemies, these are imaginary concepts that actually don't describe anything.
An illustration of this point:
Katayana once saw a man sitting in front of his house, holding a small child in his lap, eating some fish and feeding the child, and throwing the bones on the ground. There was a dog that was trying to get the remaining fish flesh off the bones and the man was kicking the dog away cause it was bothering him.
The fish that they were eating, was the father's father who had been reborn as a fish. And the dog that the man was kicking was his mother who had been reborn as a dog.
So Katayana said about this:
From Kenchen Thrangu Rinpoche (Geshe Lharampa) - Bardo Teachings