A class of beers, like decaffeinated coffee, evil in that it subverts the very reason that the modern alcoholic beverages exist. To get people drunk. In medieval times, Ale was a neccessity in that the alcohol killed the bacteria and other nasties that polluted the water supply of the time, but these days the water is clean, and people drink to loosen up a little.
Other beverages, that never had alcohol in them in the first place are also Non-Alcoholic, but who cares?