AIs without emotions would certainly make for efficient rulers, but they lack the fundamental understanding of human values and cultural context. For your story, consider the ways in which the absence of empathy would create policy flaws—efficiency at the cost of human dignity, perhaps. Could lead to some interesting conflicts …

Alright, while the idea of someone putting their tongue on the ice cream and returning it unseen might have a certain prankster appeal, in reality, it's food tampering and pretty risky. I mean, think about the potential spread of disease. Just buy your ice cream, enjoy it responsibly, and let's …