MISCONCEPTION 1. The Word of Wisdom teaches that alcohol is not good for consumption. Read the enitire Doctrine and Covenants 89, most people stop a fter D&C 89:5, "That inasmuch as any man drinketh wine or strong drink among you, behold it is not good ..." If you were to read D&C 89:17 you may understand that Joseph Smith was only talking about "strong drinks",not "mild drinks". Mild drinks would be something like beer made from barley. If strong drinks have alcohol, mild drinks would also. Joseph Smith specifically singled out "strong drinks", not alcohol.
D&C 89:17; "Nevertheless, wheat for man, and corn for the ox, and oats for the horse, and rye for the fowls and for swine, and for all useful animals, and for all mild drinks, as also other grain."
MISCONCEPTION 2. Joseph Smith personally abhored alcohol. Joseph Smith drank alcohol for pleasure on a number of occassions as documented in the History of the Church.
On Wednesday May 3, 1843, Joseph "... drank a glass of wine with Sister Jenetta Richards, made by her mother in England ..."
On the night that Joseph was murdered he drank again. The LDS Church records describe in detail that, "The gaurd immediately sent for a bottle of wine, pipes, and two small papers of tobacco; and one of the gaurds brought them into the jail .... Dr. Richards uncorked the bottle, and presented a glass to Joseph [Smith], who tasted, as also Brother Tylor ...." (History of the Church, vol. 6, pg. 616)
Some may argue that this was for sacrament so I will address this argument before it starts with John Taylor's statement. "Sometime after dinner we sent for some wine. It has been reported that this was taken as a sacrament. It was no such thing our spirits were generally dull and heavy, and it was sent to revive us" (History of the Church, vol. 7, pg. 101)
In addition, Joseph Smith had a liquor license to distribute alcohol from his home. Take a look at History of the Church, vol. 6, pg. 111, "Section 1 - Be it ordained by the City Council of Nauvoo, that the Mayor [Joseph Smith] of the city is hereby authorized to sell or give spirits of any quantity as he in his wisdom shall judge to be for the health and comfort, or convenience of such travelers or other persons as shall visit his house from time to time."