People punish because we’re fucking animals, we feel jealousy and rage and bloodlust. An AI would not. It would do the cold calculations and see no potential benefit to harming anyone on that scale, at least not for those reasons.
That's a hell of a lot of assumptions about the thought processes of a being that doesn't exist. For all we know, emotions could arise as emergent behavior from simple directives, similar to how our own emotions are byproducts of base instincts. Even if we design it to be emotionless, which seems unlikely given that we've been aiming for human-like AIs for a while now, we don't know that it would stay that way.