The ease by which a person can be convinced a certain other person must be destroyed is interesting. Somewhat resembles of a superconductor: the amount of pity drops abruptly to zero. This instinct results in a variety of social effects, e.g., genocide.
Why, evolutionarily, do we have this instinct? How does it work? I suspect it is powerfully effective to manipulate people.
Is it similar to the Lucifer effect?