Economics or social engineering?

Just heard on National radio Wayne Swan accuses the opposition of being economically irresponsible for threatening to block the alcopop tax. Economically irresponsible? I thought the tax was aimed at socially engineering young girls away from alcopops. In a speech to the National Press Club, Mr Swan said the measure had been introduced to target teenage consumption of the drinks. “And all of the medical evidence and all of the scientific evidence and all of the behavioural evidence indicates that they are responsive to price,” Mr Swan said. And all the rest of the evidence, including Swan’s words, indicates that the tax was just that, a tax with revenue in mind.