The first of course is that Madam Kirchner needs to distract her people from the disaster that is the Argentine economy.
The second is that the UK parked all of their Harriers and their albeit small carriers. They would be hard pressed to project air power to support a military defense of the Falklands.
I think they (the Brits) have an air base on the Falklands, I also think they have ground troops there as well.
Defence of the Falklands is quite strong. 4 Eurofighters, 1,000 troops and a destroyer/frigate is always in the area, plus there is the capacity to reinforce rapidly by air in less than 24 hours.
The defence has to be strong, because, as you already suggest, there isn’t much scope for getting them back if the Argies did somehow overcome the Island’s defences with their archaic, obsolescent and poorly-trained military...
There might be a third:
The Telegraph January 28, 2013