Anyone who cared enough about this kind of "privacy" could easily take measures to prevent publication of such information. Relying on senders of unsolicited email to not know something as simple as this is ridiculous and counter-productive. If You want to make a difference, lobby your representatives, write better anti-spam tools, and organize other interested individuals. Just don't try a half-ass attempt at appearing as if you're making a difference, while really accomplishing nothing. If you do that you're no better than this post.
I do take those precautions. I don't use outlook, I don't give out my email to webpages, or people I don't trust. I also voice my disapproval and refuse to help people who want to violate my rights. As diotalevi pointed out... I am accomplishing something. I know I can't teach the world to stop this at their end, so why not just not help the spammers?