I think a better question is why do we average recreational bodybuilders or plain old Joe's spend so much time and energy concerned with the fact (or assumption) that all bodybuilders are taking drugs. Shit, how many posts and discussions on this same tired ass subject have been plastered across boards all over the net (for years and years). Face it, if it were not for these same guys that you sit here and bash most of us wouldn't even waste our time with these forums, websites, magazines, supplements, etc. Come on, give it a rest. Face the facts and move on. It is what it is. The answer to your question is, Pro Bodybuilders decide to avoid the subject because they realized a long time ago the exact thing I just posted.
Pat