User blog comment:Godzillavkk/New Characters for Star Craft 3/@comment-3581786-20191014163857/@comment-4708902-20191015160126

As for Zerg that feel emotion, the idea here, is that Swarm Zerg start to evolve the ability to feel Emotion. After all, the Primal Zerg (At least right now) have no interest in galactic conquest, and the Swarm has become less of a threat with Zagara (at least for now) not interested in conquest like her predecessors. So the Zerg Swarm must find a new purpose and role.