The infraction was there so that you knew what you did wrong and can learn from your mistake rather than just deleting the message. That "fascist" Don decided that you'd like to avoid a suspension and effectively gave you the heads up. Nice to know we get thanks for that.
I see what you mean but at the time all I knew was that I'd been given an infraction for what I perceived as nothing. A post telling me the error of my ways would have sufficed.