Why does the Zelda series exclusively focus on Ganondorf as an antagonist?

[Hero_Of_Time]

emilie autumn said:
ganondorf as the final boss:

the legend of zelda
a link to the past
ocarina of time
wind waker
twilight princess

games with some other final boss:

zelda II
Links awakening
majoras mask
oracle of seasons
oracle of ages
minish cap
phantom hourglass

conlcusion: you haven't played enough zelda.

I forgot about Links Awakening, but Oracle of Season and Ages has a code to reveal Ganon is the primary villain.

EDIT:

I also do not own a DS so I have not played Phantom Hourglass. :(