Sorry, but I call bullsh*t. The errosion of liberties is a gradual thing because it is not a concerted effort to hoodwink a whole population. The fact that we actual have more personal liberty than 100 years ago always seems to be forgotten (not that I would ever defend any attempt to attack the liberties we have).
No one becomes a politician to further some grand conspiracy; be that the death of democracy you speak of, or the immigration and social cleansing the older generation warn me about.
Governments are inept and pass laws almost by random; legislation is almost always a reaction to some current situation or change in public opinion. They are pandering to what they believe the masses want, in order to secure their next vote. Occassionally they'll create a short political play in which they propose something horrible in order to pass something less horrible, but if their schemes are planned more than six months in advance, I would be utterly shocked.
In this particular case, a bunch of doctors/physicians are lobbying to reduce public health problems from alcohol. Even if they have a hidden agenda, historically it has always been shown that reducing the public's alcohol intake produces a less docile populace, so what could they hope to gain from it?
Personally, I can't see any reason to be upset by the advertising ban. Some of the adverts are amusing, most are boring, and people drink what they want to drink anyway. I've never heard anyone order a "SoCo", no matter how (cringingly) hard Southern Comfort tried to push that phrase.
But if they touch my ale, they'll be hell to pay.