This post provides an opportunity to discuss the rule against preaching, because it incorporates the very reason why the rule exists. This is a debating forum, not a congregation of lost souls. One's opinion on how best to help his fellow man does not justify preaching that others should follow another's opinion on how to live or what to believe.But if really I care about those with whom I talk, shouldn’t I share with them the purest possible truth that guarantees their satisfaction, freedom and justice for all? Sometime there is a need to talk about unfamiliar hardware under the hood to best describe a problem with the car to the customer. I as a child cried when my mother applied antiseptic to a sore that stung.
I think that if a non theist got preachy about why everyone should only believe in empirical data and that their lives would improve if they saw the error of their magical beliefs, the non theist should also get tagged for preaching. There may be a fine line between debating a position and advocating others should agree and change their lives by adopting some viewpoint.