I found the film of Sir Arthur Harris saying that quote. It was played in the documentary series War by Gwynne Dyer. See the excerpt here: https://youtu.be/t

I found the film of Sir Arthur Harris saying that quote. It was played in the documentary series War by Gwynne Dyer. See the excerpt here: https://youtu.be/tPnppCelvk0?t=48m56s https://youtu.be/tPnppCelvk0?t=48m56s