Because they can't be bothered.
Because if the dominos ever fell your way, and you had to actually run something, like a country, in a mature and responsible way, you'd be screwed.
Even before you decreed the official four day weekend, Standard and Poors would have downgraded your rating.
Then everybody would be all over you.
Running a country would be like having x number of millions, depending on the population of the country, all nagging at you at the same time.
Why would you ever want to jeopardize a good buzz with that sort of foolishness?