Saw this story in the Daily Wail while on holiday:
Don't drink more than quarter of a pint a DAY: Oxford study claims slashing the official alcohol limit would save 4,500 lives a year
Checking figure on the 'net, with a UK population of 62.3 million and average life expectancy of 80.5, that means 774,000 deaths/year. Subtracting 4500, gives a resultant life expectancy of a whisker under 81 years.
So, the killjoys might not make you live noticeably longer -- but you'd just not enjoy it so much (if the way that this contradicts all earlier findings actually holds up).
And that's before considering the cost/benefit analysis -- drinkers provide more revenue and on average cost less in lifetime medical costs anyway.