Where did you get the impression that I keep my dogs away from my chickens? Yes, one of our four dogs was very excited by the baby chicks. She was impulsive with lambs and goat kids too but she learned. Her prey drive (unusual high for the breed) was an issue from the day we got her, on the other hand, it has made her the "queen" of her flyball team.
In any case, I agree with you that a well trained dog should not need supervision around your own chickens (or other livestock) but experience has shown me that many, if not most, people don't train their dogs properly in the first place. If you disagree listen to how often most people say "NO!" before their dogs respond. IMO a properly trained dog would not have gone after the chickens in the first place.