@Darren:
Presumably you want tax breaks for not smoking, drinking, being obese, etc as well? A society that believes in giving all its citizens a subsistence income, or providing free healthcare, can't then try to stop people using its services in ways they disapprove of - not without a bureaucracy so huge it would cost far more than any money saved.
You could, of course, argue for a cut in benefits and a commensurate cut in income tax, which would achieve the same thing, but for some reason people seeing their fellow humans dying in the streets is a vote-loser.


