The mainstream body of opinion in favor of legalization does not assert (or in any way rely on the hypothesis) that it is "harmless" or "non-addictive." Right

The mainstream body of opinion in favor of legalization does not assert (or in any way rely on the hypothesis) that it is "harmless" or "non-addictive." Right away the author is making a (rather tired and puerile) straw man attack, and insulting our intelligence in doing so. It becomes very difficult to take an interest in anything he says after that.