BS. I reply to all most of the time, because usually there was a good reason why people were on the distribution list. Also I find it quite annoying if I put

BS. I reply to all most of the time, because usually there was a good reason why people were on the distribution list. Also I find it quite annoying if I put someone on the list and a responder omits them. Happens mostly with people who lack enough email experience or etiquette or are just not smart enough or careful enough to think what they are doing and the author of the article seems to be among those.